Question

when a function can be written as an equation the symbol f(x) replace y and is read as "the value of f at x" or simply "f of x"

Answer 1

The functon is f(x) = 2x -3.

Substitute -2 for x in the function to obtain the value of f(-2) .

`\begin{gathered} f(-2)=2\cdot(-2)-3 \\ =-4-3 \\ =-7 \end{gathered}`

So f( -2 ) = -7.

(b)

Substitute 7 for x in the function to obtain the value of f(7).

`\begin{gathered} f(7)=2\cdot7-3 \\ =14-3 \\ =11 \end{gathered}`

So answer is f( 7 ) = 11.

(c)

Substitute -4 for x in the function to obtain the value of f( -4 ).

`\begin{gathered} f(-4)=2\cdot(-4)-3 \\ =-8-3 \\ =-11 \end{gathered}`

So answer is f( -4 ) = -11.