Question

1. If a + b = 8 and ab = 6, find the value of a + b).
2 Ifa-b=6 and ab = 20, find the value of a -63.​

Answer 1

Step-by-step explanation:

ANSWER

Formula,

(a−b)

3

=a

3

−3ab(a−b)−b

3

Given,

⇒6

3

=a

3

−b

3

−3(20)(6)

∴a

3

−b

3

=216+360=576