Learn Before
Approximating Higher Roots with a Calculator
Just as a calculator's key provides decimal approximations for square roots, the key (or its equivalent for higher indices) is used to find decimal approximations for roots with an index greater than . For a number that is not a perfect th power, the calculator returns a rounded decimal approximation rather than an exact value. For example, using a calculator to evaluate yields an approximation such as 3.105422799, which can be rounded to two decimal places as 3.11. To verify that this is an approximation, raising the rounded result to the fourth power gives , which is close to but not exactly . The approximation symbol indicates that the value is rounded.
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OpenStax
Intermediate Algebra @ OpenStax
Ch.8 Roots and Radicals - Intermediate Algebra @ OpenStax
Algebra
Related
Distinguishing Exact and Approximate Square Roots
Approximating Higher Roots with a Calculator
A calculator display of is an exact value.
What does mean in ?
Why is an approximation?
Order the steps to approximate to two decimal places and check it.
A calculator shows . How can you check that this value is an approximation?
Match each square root with its calculator result.
Classify each calculator result as exact or approximate. Then explain why the second result is approximate.
A calculator shows . What term describes 3.31662479?
A calculator gives an approximation for because is not a _____.
Learn After
Rounding and to Two Decimal Places
As a packaging designer, you use your calculator's key to find the cube root of a container's volume, which is not a perfect cube. According to the principles of evaluating higher roots, what type of value does the calculator provide in this scenario?
A quality control inspector is reviewing a technical drawing for a custom cubic storage unit. The side length was calculated as the cube root of the volume, which is 210 cubic feet. Since 210 is not a perfect cube, the inspector should expect the recorded dimension to use the approximation symbol rather than an equal sign to show that the decimal value is a rounded result.
An engineering technician is using a calculator to determine the dimensions of a specialized part that requires finding higher-order roots. Match each calculator function or mathematical symbol with its correct role in the approximation process.
Verifying Root Approximations in Technical Reports
A research assistant is following a standard operating procedure (SOP) to approximate and verify a higher root for a value that is not a perfect power. Arrange the following steps in the correct chronological order according to the standard mathematical protocol.
A logistics coordinator is calculating the side length of a cubic shipping crate with a volume of 150 cubic feet using a calculator. Because 150 is not a perfect cube, the coordinator must record the result using the _________ symbol () to show that the calculated side length is a rounded value rather than an exact value.
Quality Assurance Report on Machine Tolerances