Approximate a square root EXAMPLE 2 FURNITURE The top of a folding table is a square whose area is 945 square inches. Approximate the side length of the.

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Presentation transcript:

Approximate a square root EXAMPLE 2 FURNITURE The top of a folding table is a square whose area is 945 square inches. Approximate the side length of the tabletop to the nearest inch. SOLUTION 2 = You need to find the side length s of the tabletop such that s 945. This means that s is the positive square root of 945. You can use a table to determine whether 945 is a perfect square.

Approximate a square root EXAMPLE 2 Number Square of number As shown in the table, 945 is not a perfect square. The greatest perfect square less than 945 is 900. The least perfect square greater than 945 is < 945 < 961 Write a compound inequality that compares 945 with both 900 and 961. < <  961  900  945 Take positive square root of each number. 30  945 < < 31 Find square root of each perfect square.

Approximate a square root EXAMPLE 2 Because 945 is closer to 961 than to 900, is closer to 31 than to 30.  945 ANSWER The side length of the tabletop is about 31 inches.

Approximate a square root EXAMPLE 2 GUIDED PRACTICE for Example 2 Approximate the square root to the nearest integer. 5.    48 – – 7 8.  350 – – 19