Q5) Find the value of ab and a3-b3 if a-b=4 and a2+b9=40.
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Answered by
0
Answer:
I am sorry I don't know what is the answer
Answered by
0
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
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