Which represents a quadratic function? a)f(x) = −8x3 − 16x2 − 4x b)f (x) = x 2 + 2x − 5 c)f(x) = + 1 d) f(x) = 0x2 − 9x + 7

B)  f (x) = x² + 2x − 5 is quadratic function .

Step-by-step explanation:

Given : Functions .

To find : Which represents a quadratic function.

Solution : We have given functions .

Quadratic function in form of ax² + bx + c = 0 which has degree 2.

Then we can see f (x) = x² + 2x − 5  inform of quadratic function .

Where , a = 1 ,b =2 ,c = -5.

Option D  also has degree 2 but its coefficient of  x² is 0. so, we will not consider it.

Therefore, B)  f (x) = x² + 2x − 5 is quadratic function .

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.

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step-by-step explanation: