Question

Evaluate -3x3-4x for x= -1.
1
7
-1​

Answer 1

The correct a sweet is 7

Step-by-step explanation

The given algebraic expression is;

`f(x) = - 3 {x}^(3) - 4x`

To evaluate this function for f means, we should substitute x=-1 wherever we see x in the given expression.

`f( - 1) = - 3 { (-1 )}^(3) - 4( - 1)`

`f( - 1) = - 3 { (-1 )} - 4( - 1)`

This simplifies to

`f( - 1) = 3 + 4`

`f( - 1) = 7`

The correct answer is 7