Question

I tried to do this problem but got stuck can someone please help???

Answer 1

Answer: x = 6

Step-by-step explanation:

Answer 2

$216 + x = x(x {}^{2} - 5) + 6x$

$216 + x = x {}^{3} - 5x + 6x$

Add like terms

$216 + x = x {}^{3} + x$

Subtract x form both sides and they both cancel out

$216 = x {}^{3}$

Subtract 216 from both sides

$216 - x {}^{3} = 0$

Plug in your calculator, in your "y=" and look at your zeros and *check if they equal each other by substituting x with the zeros and that ones that work is your answer.