Question

Evaluate the function. f(x) = -x^2+6x-18

Find f(−3)

Answer 1

`{ \tt{f(x) = - {x}^(2) + 6x - 18}}`

• when f(x) is f(-3), then x is -3. Substitute for x as -3:

`{ \sf{f( - 3) = - {( - 3)}^(2) + 6( - 3) - 18 }} \\ \\ { \sf{f( - 3) = - 9 - 18 - 18}} \\ \\ \dashrightarrow \: { \boxed{ \tt{f( - 3) = - 45}}}`