Question

find a value of x^2 + y^3 + 15 xy -125 if x+y=5​

Answer 1

Answer:

y³-14y²+65y-100 IS THE ANSWER!!!

Step-by-step explanation:

x²+y³+15xy-125                       (GIVEN VALUE FOR x+y=5)

                                                                                  (x = 5-y)

SUBSTITUTING THE VALUE FOR x,

WE GET,

x²+y³+15xy-125

(5-y)²+y³+[15(5-y)y]-125

25+y²-10y+y³+[(75-15y)y]-125

25+y²-10y+y³+75y-15y²-125

y³-15y²+y²+75y-10y-125+25

y³-14y²+65y-100

I HOPE YOU UNDERSTOOD THE QUESTION!!!