Question

How do you expand `(y-3x^2)^2`?

Answer 1

`(y - 3x^2)^2 = (y - 3x^2) (y - 3x^2)`

This expands to

`y^2 -3xy^2 -3xy^2 + 9x^4`

Which is equal to

`y^2 -6xy^2 + 9x^4`