Find a: (x+3)(x+a)(x+7)=x³+15x²+71x+105

1 answer
Question:

Find a:
(x+3)(x+a)(x+7)=x³+15x²+71x+105

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Answer:a = 5Step-by-step explanation:(x+3)(x+a)(x+7)=x³+15x²+71x+105(x+3)(x+a)(x+7) = (x²+10x+21)(x+a) = x³ + (10+a)x² + (21+10a)x + 21a21a = 105a = 5check: 21 + 10a = 71   ... 71x             10 + q = 15  .... 15x²

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