2 years ago

What is the value of z so that -9 and 9 are both solutions of x^2+z=103?

1 answer:

8 0

The answer is C.
x^2 + z = 103x^2 + 22 = 103*Subtract both sides by 22*x^2 + 22 - 22 = 103 - 22x^2 = 81*square root both sides to find x*√x^2 = √81
x = +- 9

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