Can someone answer 718 please it would be very helpful to s

Can someone answer # 7-18 please? it would be very helpful to see work as well! Thank you!

8x^3 - 27 x^9 + y^6 8x^12 - 27y^15 64a^18 + 125 ax + bx + a + b 2x^6 + 128 a(b + 3) - 2(b + 3) a(b - 3) - 2(3 - b) ab - 2a + 5b - 10 3ab - 2 + 2b - 10 4x3 - 19x62 + 15x 15x^2 + 23x + 6

Solution

7. 8x^3 -27 = (2x)^3 - (3)^3

use a^3 - b^3 = ((a -b)(a^2 +b^2 +ab)

8x^3 -27 = (2x)^3 - (3)^3

=(2x -3)( 4x^2 +9 6x)

8) x^9 + y^6 = (x^3)^3 + (y^2)^3

use a^3 + b^3 = ((a +b)(a^2 +b^2 -ab)

(x^3 +y^2)(x^6 + y^4 - x^3y^2)