Which is a zero of the quadratic function f of x is equal to 4 x squared plus 24 x plus 11 ?
Answer
A
x is equal to 0 point 5
B
x is equal to 3 point 2 5
C
x is equal to negative 9 point 2 5
D
x is equal to negative 5 point 5
Explanation
A zero makes the function equal to 0, so solve 4x² + 24x + 11 = 0. Factoring gives (2x + 1)(2x + 11) = 0, so x = −0.5 or x = −5.5. The listed zero is x = −5.5, choice D.
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