~~7)If a+b=10 and a2 +b2 =58,find the value of a3 +b3
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(10-b)^2 + b^2 =58
or, 100 + b^2 - 20b + b^2 = 50
or, 2b^2 - 20b + 100 -50 =0
or, b^2 -10b +25 = 0
or, (b-5)^2 =0
b = 5
or, 100 + b^2 - 20b + b^2 = 50
or, 2b^2 - 20b + 100 -50 =0
or, b^2 -10b +25 = 0
or, (b-5)^2 =0
b = 5
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