Question

x-y=4,Xy=45, then x³-y³=?​

Answer 1

Answer:

the ans is 588

Step-by-step explanation:

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

=>(4)^3+3×45(4)

=>48+540

=>588

Answer 2

answer:604

explanation:

x-y=4 ___ 1st equation

xy=45____2nd equation

x=4+y___ from 1st equation and substitute this in 2nd equation

(4+y)y=45

4y+y^2=45

y^2+4y-45=0

by using factorization method we get

y=5(substitute this I equation 1) then

x-5=4

x=9

by this we got the values of x,y substitute them in given question we get

9^3-5^3=725-125=604