Question

x+y)^(4)-9(2x-2y)^(4)

Answer 1

Answer:

=x^4+y^4-9{(2x)^4-(2y)^4}

=x^4+y^4-9(16x^4-16y^4)

=x^4+y^4-144x^4-144y^4

=(x^4-144x^4)+(y^4-144y^4)

=(-143x^4)+(-143y^4) or (-143x^4-143y^4)