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OpenStudy (anonymous):
divide and simplify. x^2-81/x\[\div\]x-9/x+7
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OpenStudy (aroub):
x^2-81 x-9 ------- ÷ ---------- x x+7 = (x-9)(x+9) x+7 ---------- * -------------- x x-9 = (x+9) x+7 ------ * ---------- x 1 = (x+9) (x+7) ------------ x \[x \neq 0 \]
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