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How to Solve a Quadratic Equation by Completing the Square
To solve a quadratic equation of the form by completing the square, follow a six-step procedure:
Step 1. Isolate the variable terms on one side and the constant terms on the other. Move the constant to the right side of the equation so the left side contains only .
Step 2. Find , the number needed to complete the square, and add it to both sides of the equation. Take half the coefficient of the linear term, square it, and add that value to both sides. This preserves the equality — whatever is added to one side must also be added to the other.
Step 3. Factor the perfect square trinomial as a binomial square. The left side is now a perfect square trinomial that factors into the square of a binomial.
Step 4. Use the Square Root Property. Apply , where is the simplified value on the right side.
Step 5. Simplify the radical and solve the two resulting equations. If the radicand is a perfect square, simplify to an integer; otherwise, simplify using the Product Property of Square Roots.
Step 6. Check the solutions. Substitute each value back into the original equation to confirm both sides are equal.
This procedure combines the completing-the-square technique (Steps 1–3) with the Square Root Property (Steps 4–5) to solve quadratic equations that may not be factorable. The critical requirement in Step 2 is that the same constant must be added to both sides of the equation to maintain the equality.
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Elementary Algebra @ OpenStax
Ch.10 Quadratic Equations - Elementary Algebra @ OpenStax
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Solving by Completing the Square
Solving by Completing the Square
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Solving by Completing the Square
A landscape architect is designing a square garden plot. To complete the square for the expression x^2 + 10x, arrange the following steps in the correct order.
A floor installer is calculating the area for a square room. To transform the expression x^2 + 14x into a perfect square trinomial, what constant value must be added?
A logistics coordinator is modeling the expansion of a square shipping zone using the expression x^2 + 20x. To complete the square and determine the necessary constant to add to the expression, the coordinator must take half of the linear coefficient (20) and then ____ that value.
An inventory specialist is designing a series of square storage bins for a new warehouse layout. To calculate the necessary dimensions using the 'completing the square' method, match each algebraic layout expression with the specific constant value that must be added to transform it into a perfect square trinomial.
Standard Procedure for Completing the Square
True or False: A facilities manager calculating the dimensions for a square office expansion using the expression determines that the constant value to be added to 'complete the square' is found by first squaring the linear coefficient (16) and then taking half of that result.
Structural Integrity Audit: Square Completion Protocol
Documentation of the 'Completing the Square' Algorithm
A technical documentation specialist is updating a manual for an engineering firm. In a section regarding quadratic modeling, they describe adding a constant to an expression of the form so that it can be factored as the square of a binomial. What is the specific algebraic name for the resulting three-term expression?
A technical illustrator is creating a procedural flowchart for the 'completing the square' method using the expression . When documenting the step where a constant is added to create a perfect square trinomial, which of the following fundamental rules must the illustrator recall?
Learn After
Completing the Square When the Leading Coefficient Is Not One
An interior designer is determining the dimensions of a rectangular workspace using the equation x^2 + 8x - 20 = 0. To solve for x by completing the square, arrange the following steps in the correct procedural order from start to finish.
A logistics manager is modeling the growth of a warehouse storage zone using the equation x^2 + 12x = 45. According to the standard procedure for solving by completing the square, what specific constant value must be added to both sides of the equation to create a perfect square trinomial on the left side?
Initial Step in Completing the Square
A warehouse supervisor is using the 'completing the square' method to solve a quadratic equation for an inventory layout. At the current stage of the process, the equation is written as . True or False: According to the standard six-step procedure, the supervisor's next step is to apply the Square Root Property to both sides of the equation before attempting to isolate .
A technical documentation team is creating a 'Standard Operating Procedure' (SOP) for solving quadratic equations using the 'completing the square' method. To ensure all staff follow the same mathematical logic, match each procedural step with its corresponding required action.
Storage Capacity Optimization
A technical documentation specialist is writing a manual on algebraic modeling for a logistics firm. In the section on 'completing the square,' the specialist notes that after calculating the value , the most critical requirement to maintain the balance of the equation is to add this value to ________ of the equation.
Standard Operating Procedure for Storage Optimization
A technical specialist is following a standard operating procedure to solve a quadratic equation for a structural load calculation. During the fifth step of the 'completing the square' method, the specialist must simplify the radical. According to the procedure, if the radicand is not a perfect square, which specific mathematical property should be used to simplify the radical?
A technical documentation specialist is writing a 'Quick Reference Guide' for a logistics firm's algebraic modeling software. The guide outlines the standard procedure for solving quadratic equations in the form by 'completing the square.' According to the procedure, what specific formula must be used in Step 2 to calculate the constant value that completes the square?