Question

find the expansions of the following a (3xby2-4y)2​

Answer 1

Answer:

we know (a-b)^2=a^2-2ab+b^2

so,

(3xby^2-4y)^2

=(3xby^2)^2-2.3xby^2.4y+(4y)^2

=9x^2b^2y^4-24xby^3+16y^2

=y^2(9x^2b^2y^2+24xby+16)