Question

plz answer this guy's

Answer 1

Step-by-step explanation:

if x+y = 5

then

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

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

5 ^3 - 15 xy + 15 xy - 125

= 0

Answer 2

Answer:

$\textcolor{red}0$

Step-by-step explanation:

$\text{We have:}\\ x^3+y^3= (x+y)^3-3xy(x+y)\\</p><p>\text{Let given expression be E}.\\</p><p>\text{Hence,} \: E=(x+y)^3-3xy(x+y)+15xy-125\\</p><p>E= (5)^3-xy(3(x+y)-15)-125\\</p><p>E=125-xy(15-15)-125\\</p><p>E=0$