Question

Q5) Find the value of ab and a3-b3 if a-b=4 and a2+b9=40.​

Answer 1

Answer:

I am sorry I don't know what is the answer

Answer 2

Answer:

Given,

a−b=4,ab=21

Then,

⇒(a−b)

3

=a

3

−3a

2

b+3ab

2

−b

3

=a

3

−3ab(a−b)−b

3

⇒4

3

=a

3

−b

3

−3(21)(4)

⇒64+252=a

3

−b

3

∴a

3

−b

3

=316