How do you find the product of (-9x^2-10y)^2?

1 Answer
Jul 8, 2016

(-9x^2-10y)^2=color(blue)(81x^4+180x^2y+100y^2)

Explanation:

In general (a+b)^2=a^2+2ab+b^2

If a=-9x^2 and b=-10y
then
color(white)("XXX")a^2color(white)("XXX")=81x^4
color(white)("XXX")2abcolor(white)("XX")=180x^2y
color(white)("XXX")b^2color(white)("XXX")=underline(100y^2)
color(white)("XXXXXXXXXX")81x^4+180x^2y+100y^2