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 Question from Kathy, a parent: My daughter and I are having trouble solving this equation: -x²+ (yz - 3)² if x= -4,y=2 and z=0 We are having difficulty with the -x² part of the equation. Thanks

Kathy,

The convention in evaluating a mathematical expression is to evaluate exponents (powers) before multiplication or addition. Thus for -x2 you first evaluate x2 and then multiply by -1. Hence with x = -4, x2 = (-4)2 = 16 and therefore -x2 = -16.

I hope this helps,
Penny

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