Question

(x+2)3+(x-1)3 =9
(x+2)3-(x-1)3=7 ?​

Answer 1

Step-by-step explanation:

(x+2)3+(x-1) 3=9

3x+6+3x-3=9

9x+3=9

9x=6

x=6/9=2/3

(x+2)3-(x-1) 3=7

3x+6-3x+3=7

9=7

So it's the answer