Question

Evaluate the function. f(x)=−x^2 −6x+12 Find f(4)

Answer 1

1. How to find f(4)?

• I explained how to find f(5) in your previous question. It is exactly the same. We substitute x = 4 in the equation.

2. Substitution and Evaluate

$\large{f(4) = - {(4)}^{2} - 6(4) + 12}$

Follow BODMAS/PEMDAS rules as well! Exponent first.

$\large{ f(4) = - 16 - 24 + 12} \\ \large{f(4) = - 40 + 12} \\ \large{f(4) = -2 8}$

3. Final Answer

• f(4) = -28.