Question

f(x)=4x^2-x

find f(-3)

Answer 1

\[\Large f(\color{#CC0033}{x})\quad=\quad4(\color{#CC0033}{x})^2-(\color{#CC0033}{x})\]So plugging in -3 for each x will give us:\[\Large f(\color{#CC0033}{-3})\quad=\quad4(\color{#CC0033}{-3})^2-(\color{#CC0033}{-3})\]

Answer 2

Do you understand how to simplify that?
Start with the exponent, (-3)^2 = ?

Answer 3

no

Answer 4

33

Answer 5

find the solution by substituting x with -3

Answer 6

\[\Large -3\cdot-3\quad=\quad ?\]