Question

If ${\displaystyle f\left(x\right)=2x^2-13x^2+17x+12}$ find ${\displaystyle f-\left(3\right)}$

Answer 1

We have

${\displaystyle f\left(x\right)=2x^2-13x^2+17x+12}$

${\displaystyle f(-3)=2\times {(-3)}^3-13\times {(-3)}^2+\times (-3)+12}$

${\displaystyle =2\times (-27)-13\times \left(9\right)+17\times (-13)+12}$

${\displaystyle =-54-117-51+12=210}$