Question

If a+b=12,ab=20 find the value of a3+b3

Answer 1

Answer:

(a+b)^3 = a^3 + b^3 +3ab(a+b)

12^3 = a^3 + b^3 + 3×20(12)

1728 = a^3 + b^3 + 720

1728 - 720 = a^3 + b^3

1008 = a^3 + b^3