Algebrahard · Past Paper
Find the value of x^3 + y^3 if x+y=5 and xy=6.
A35
B125
C95
D65
✓ Correct Answer: A — 35
x^3 + y^3 = (x+y)^3 - 3xy(x+y) = 5^3 - 3(6)(5) = 125 - 90 = 35.
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✓ Correct Answer: A — 35
x^3 + y^3 = (x+y)^3 - 3xy(x+y) = 5^3 - 3(6)(5) = 125 - 90 = 35.
Share this question