Question

find the value of x³ - 8y³ - 36xy - 216 when X = 2y + 6​

Answer 1

Answer:

step by step

1. value of x=2y+6 (given)
2. putting value
3. (2y +6)^3 - 8(2y + 6)^3 - 36(2y - 6)y - 216
4. (8y + 21) -(64y + 168) - (72y -216)y - 216
5. 8y + 21 - 64y+168 -216-(72y -216)y
6. 8y-64y+21+168-216-(72y-216)y
7. 56y-27-(72y-216)y
8. 56y-27-72y^2-216y
9. -160y-72y^2-27  ......... answer

Answer 2

Answer:

Step-by-step explanation:

value of x=2y+6 (given)

putting value

(2y +6)^3 - 8(2y + 6)^3 - 36(2y - 6)y - 216

(8y + 21) -(64y + 168) - (72y -216)y - 216

8y + 21 - 64y+168 -216-(72y -216)y

8y-64y+21+168-216-(72y-216)y

56y-27-(72y-216)y

56y-27-72y^2-216y

-160y-72y^2-27