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Question

Given, a+b=10,a2+b2=58, then find a3+b3=

A
340
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B
370
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C
390
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D
410
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Solution

The correct option is B 370

Given a+b =10

so (a+b)2=a2+b2+2ab102=58+2ab2ab=10058=42ab=21(a+b)3=a3+b3+3ab(a+b)103=a3+b3+3×21×10a3+b3=1000630=370


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