Lesson Menu Five-Minute Check (over Chapter 9) Then/Now New Vocabulary Key Concept: Square Root Example 1: Find Square Roots Example 2: Estimate Square Roots Example 3: Use a Calculator to Estimate a Square Root Example 4: Use a Calculator to Estimate a NegativeExample 4: Use a Calculator to Estimate a Negative Square RootSquare Root Example 5: Real World Example: Use Square Roots to Solve Problems
Over Chapter 9 5-Minute Check 1 A.10a 2 b 3 B.5 2 a 2 b 3 C.10ab 5 D.5ab 5 Write 5 5 a a b b b using exponents.
Over Chapter 9 5-Minute Check 2 A.2xy B. 4xy C. 4(xy) 4 D.(xy) 4 Write x y x y x y x y using exponents.
Example 3 Use a Calculator to Estimate a Square Root Use a calculator. Round to the nearest tenth. Check for Reasonableness Since 8 2 = 64, the answer is reasonable. ENTER2nd 577.549834435
Example 3 A.3.9 B.9.8 C.38.5 D.There is no real square root.
Example 4 Use a Calculator to Estimate a Negative Square Root Use a calculator. Round to the nearest tenth. Check for Reasonableness Since 7 2 = 49, the answer is reasonable. ENTER2nd 426.480740698
Example 4 A.–8.5 B.–36.0 C.8.5 D.There is no real square root.
Example 5 Use Square Roots to Solve Problems SKYSCRAPER The tallest building in Houston, Texas, is the JP Morgan Chase Tower, standing at 1002 feet. About how far to the horizon can a person standing on the top floor see? Round your answer to the nearest tenth. Replace h with 1002. Evaluate the square root first. Write the formula.
Example 5 Use Square Roots to Solve Problems 38.6Multiply. Answer: On a clear day, a person could see about 38.6 miles.
Example 5 A.23.2 miles B.23.3 miles C.23.7 miles D.24.4 miles
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