Question

Check whether 7+3x is a factor of
$3 {x}^{3} + 7x$
​

Answer 1

7+3x=0

3x=-7

x=-7/3

Putting x=-7/3

3×(-7/3)^3+7×(-7/3)

3×-343/27+-49/3

-343/9-49/3

-343-147/3

490/3

Hope my answer helps u