Question

F(3)= 5x^2 - 4x + 9
evaluate this quadratic function

Answer 1

`f(3) = 38`

Explanation:

Given the quadratic function

`f\left(x\right)=\:5x^2\:-\:4x\:+\:9`

Evaluating the quadratic function

`f\left(x\right)=\:5x^2\:-\:4x\:+\:9`

substitute x = 3

`f\left(3\right)=\:5\left(3\right)^2\:-\:4\left(4\right)\:+\:9`

`f(3) = 45-16+9`

`f(3) = 38`

Therefore,

• 
  `f(3) = 38`