find the value of x cube + y cube + 15xy - 125 if X + Y is equal to 5
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227
Given Equation is (x + y) = 5.
On cubing both sides ,we get
(x + y)^3 = 5^3
x^3 + y^3 + 3xy(x + y) = 125
x^3 + y^3 + 3xy(5) = 125
x^3 + y^3 + 15xy = 125
x^3 + y^3 + 15xy - 125 = 0
Hope this helps!
On cubing both sides ,we get
(x + y)^3 = 5^3
x^3 + y^3 + 3xy(x + y) = 125
x^3 + y^3 + 3xy(5) = 125
x^3 + y^3 + 15xy = 125
x^3 + y^3 + 15xy - 125 = 0
Hope this helps!
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38
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