SOLUTION: I need help. (-9x^2-10y)^2

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Question 853017: I need help. (-9x^2-10y)^2
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
What is your problem?
BTW Lovely expression that you have there!
(-9x^2-10y)*(-9x^2-10y)
USE FOIL
First Outer Inner Last
(-9x^2)*(-9x^2)=81x^4
(-9x^2)*(-10y)=90x^2y
(-10y)*(-9x^2)=90x^2y
(-10y)*(-10y)=100y^2
add them