Question

If x+y=4 & xy=5 find value of (x3+y3)

Answer 1

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(x+y)3 = x3 + y3 +3xy(x+y)

53 = x3 +y3 + 3*4(5)

125 = x3 + y3 +12*5

125 = x3 + y3 + 60

125 - 65 = x3 + y3

60 = x3 + y3



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