Answer:
last option (x-2)(x+1)/3
Explanation:
(x^2-4)/(x-7) ÷ (3x+6)/(x^2-6x+7)
(x^2-4)/(x-7) * (x^2-6x+7)/(3x+6)
(x+2)(x-2)/(x-7) * (x-7)(x+1)/3(x+2)
(x-2)/1 * (x+1)/3
(x-2)(x+1)/3
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