Question

if a-b =7 a2 + b 2 = 85 find a3 - b3​

Answer 1

Here's your answer

Step-by-step explanation:

a-b=7

=[a-b]^2 =[7]^2

=[a^2+b^2]-2ab=49

[a^2+b^2+85]

=85-2ab=49

=85-49=2ab

=36=2ab

=ab=18

Now, a^3-b^3=(a-b)^3 + 3ab(a-b)

=(7)^3+3*18*7

=343+378

=721

Hope It Helps u!!!!!!