Advanced Math practice question

Answer: A. 1 < x < 7

p(x) = (x − 1)(x − 7), which is negative between its zeros.

Why the other answers are wrong

B. x < 1 or x > 7

That is where p(x) is positive.

C. −7 < x < −1

The zeros are 1 and 7, not −1 and −7.

D. 0 < x < 8

0 and 8 give p = 7, which is positive.

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