Answer:
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.
