Question

17. What are the roots of the equation s² - 7 = 74?

18. One of the roots of x² - 8x = 0 is 8. What is the other root?

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Answer 1

17. s = 9

18. x = 8x^(½)

Explanation:

s² - 7 = 74?

s² = 74 + 7

s² = 81

√(s²) = √(81)

s = 9

x² - 8x = 0

x² = 0 + 8x

x² = 8x

√(x²) = √(8x)

x = 8x^(½)

OR by factoring

x²−8x=0

x(x−8)=0

x=0 or x−8=0

x=0 or x=8