Learn Before
Completing the Square for
Complete the square for the expression to form a perfect square trinomial, then express the result as a binomial square.
Step 1 — Identify . The coefficient of is , so .
Step 2 — Find . Compute half of : . Square the result: .
Step 3 — Add to the expression.
Rewrite as a binomial square. The completed trinomial factors as:
This example applies the completing-the-square procedure when the linear coefficient is a positive even integer. Taking half of yields , and squaring produces the constant that transforms the two-term expression into the perfect square trinomial .
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Ch.10 Quadratic Equations - Elementary Algebra @ OpenStax
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Learn After
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A site engineer is finalizing the blueprints for a square building foundation whose area is initially modeled by the expression . After completing the square by adding the necessary constant, which binomial square correctly represents the standardized area of the foundation?
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