Question

Given f(x) =-x^2 + 2x + 9, find f (3)

Answer 1

`{ \qquad\qquad\huge\underline{{\sf Answer}}}`

Here's the solution ~

`\qquad \sf  \dashrightarrow \:f(x) = {x}^(2) + 2x + 9`

[ plug in the value of x in the expression ]

`\qquad \sf  \dashrightarrow \: f(3) = (3) {}^(2) + 2(3) + 9`

`\qquad \sf  \dashrightarrow \: f(3) = 9+6 + 9`

`\qquad \sf  \dashrightarrow \: f(3) = 24`