Let f(x)=4x2−5x+9. What is the value of f(−5)? Group of answer choices

28

-66

43

134

f(-5) = 134

Step-by-step explanation:

f(x) = 4x² - 5x + 9

f(anything) will set the value of x to the value thats in f(x).

f(-5) = 4(-5)² - 5(-5) + 9

Square the -5. Remember, (-x)² = (-x) * (-x) = x²

f(-5) = 4(25) - 5(-5) + 9

Multiply 4 and 25, and -5 and -5.

f(-5) = 100 + 25 + 9

Add 25 and 100.

f(-5) = 125 + 9

Add 125 and 9.

f(-5) = 134.

step-by-step explanation: