Find the value of x^3+y^3+15xy-125 if x+y=5
Answers
Answered by
0
Answer:
x+y=5
cubing both side
x³+y³+3x²y+3xy²=125
x³+y³= 125-3x²y- 3xy²
put it in given equation
125-3x²y-3xy²+15xy-125
= -3x²y-3xy²+15xy
= -3xy( x + y - 5 )
now put value of x+y =5
= -3xy( 5-5)
= -3xy ×0
= 0 ans
Answered by
0
Answer:
...................................
Similar questions