Question

If `f(x) = 3x^2 - x`, how do you find f(-2)?

Answer 1

`f(-2)=14`

Explanation:

`"substitute " x = - 2" into "f(x)`

`f(color(red)(-2))=(3xxcolor(red)((-2)^2))-(color(red)(-2))`

`color(white)(xxxx)=(3xx4)+2=12+2=14`