Advanced Math practice question

Answer: A. y = (x + 1)(x − 4)

A factor of (x + 1) gives a zero at x = −1, and (x − 4) gives a zero at x = 4. Check: (−1 + 1)(−1 − 4) = 0 and (4 + 1)(4 − 4) = 0.

Why the other answers are wrong

B. y = (x − 1)(x + 4)

(x − 1)(x + 4) has zeros at x = 1 and x = −4 — the signs are reversed.

C. y = (x + 1)(x + 4)

(x + 1)(x + 4) has zeros at x = −1 and x = −4.

D. y = x² − 4

x² − 4 has zeros at x = 2 and x = −2.

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