Question

What is the value of the expression below when x=3?
7x2-3x-6

Answer 1

Hey there !

• let f(x) be:

`{ \tt{f(x) = 7 {x}^(2) - 3x - 6}}`

• substitute x as 3:

`{ \tt{f(3) = 7 {(3)}^(2) - 3(3) - 6 }} \\ \\ { \tt{f(3) = 63 - 9 - 6}} \\ \\ \dashrightarrow \: { \underline{ \underline{ \tt{ \: \: f(3) = 48 \: \: }}}}`