Question

x(x^3 - y^3) + 3xy (x - y)​

Answer 1

Answer:

$x(x {}^{3} - y {}^{3} ) + 3xy(x - y) \\ x {}^{4} - xy {}^{3} + 3x {}^{2} y - 3xy {}^{2} \\ arrange \: into \: standard \: form \\ = x {}^{4} + 3x {}^{2} y - xy {}^{3} - 3xy {}^{2}$

Hope it helps you.