a-b=4
a3-b3=88
a2-b2=?
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Answer:
Step-by-step explanation:
a3 – b3 = (a – b)(a2 + ab + b2)
56 = 2(a2 + ab + b2)
28 = (a2 + ab + b2) ----(1)
Now, (a – b)2 = a2 – 2ab + b2 = 4 ----(2)
Solving equation (1) and (2),
a2 + ab + b2 = 28
a2 – 2ab + b2 = 4
3ab = 24
ab = 8
Therefore, a2 + 8 + b2 = 28 in (1)
And a2 + b2 = 28 – 8 = 20
Answered by
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Step-by-step explanation:
ए स्क्वायर प्लस बी स्क्वायर इज इक्वल टू 8 - 8 इज इक्वल टू
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