20. If x + y = 7 and x2 + y2 = 25, find the value of x3 + y3.
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Answer:
(x+y)²=x²+y²+2xy
xy=12.
(x+y)³=x³+y³+3xy(x+y)
substitute the values to get
7³=x³+y³+3*12*7
x³+y³=91
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