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Find the value of x^3+y^3+15xy-125 if x+y=5
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Find the value of x^3+y^3+15xy-125 if x+y=5

User Nauman Khalid
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Answer:

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Explanation:

x+y=5

x^3+y^3+15xy-125

(x+y)(x^2-xy+y^2)+15xy-125

5(x^2-xy+y^2)+15xy-125

5x^2+5y^2-5xy+15xy-125

5x^2+5y^2+10xy-125

5[x^2+2xy+y^2]-125

5(x+y)^2-125

5(5)^2-125

125-125

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User Lop Hu
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