Solving Quadratic Equations: Zero Product Property

Question 14 • 26MATH_Recovery_Alg1B22

Which function has real zeros at x = 3 and x = 7?

Answer

f(x) = x2 + 4x – 21

f(x) = x2 – 4x – 21

f(x) = x2 – 10x + 21

f(x) = x2 – 10x – 21

A quadratic with zeros at x = 3 and x = 7 has factors (x − 3) and (x − 7). Multiplying gives (x − 3)(x − 7) = x² − 10x + 21, which matches choice C.

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