4.Multiply and simplify by combining like terms:(−9)2−(+8)2 (Pic of the question in attachment need step by step)
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Step-by-step explanation:
(x-9)²-(x+8)²
(x²-2*x*9+9²)-(x²+2*x*8+8²)
x²-18x+81-x²-16x-64
-34x+17
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