If x+y =5 find xcube +ycube +15xy
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Answer:
hey mate here is ur answer
Step-by-step explanation:
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Answered by
1
Answer:
125
Step-by-step explanation:
x+y=5
(x+y) square=5square
xsquare+ysquare+2xy=25
xsquare+ysquare=25-2xy
xcube+ycube+15xy
=(x+y)(xsquare+ysquare-xy)+15xy
as xsquare+ysquare=25-2xy
xcube +ycube+15xy=
(x+y)(25-2xy-xy)+15xy
5(25-3xy)+15xy
125-15xy+15xy=125
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