SOLUTION: I was wondering if I got this problem right. Multiple polynomial. (5a-2b)^2 The answer I got was 25a^2-20ab+4b^2. Is this right?

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: I was wondering if I got this problem right. Multiple polynomial. (5a-2b)^2 The answer I got was 25a^2-20ab+4b^2. Is this right?      Log On


   

Question 253219: I was wondering if I got this problem right. Multiple polynomial. (5a-2b)^2 The answer I got was 25a^2-20ab+4b^2. Is this right?
Found 3 solutions by Alan3354, Greenfinch, richwmiller:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
That's right.

Answer by Greenfinch(383) About Me  (Show Source):
You can put this solution on YOUR website!
Yes you are right. I tend to call this "expanding" rather than "multiplying"
(5a - 2b)^2 = (5a -2b)(5a - 2b)
so 5a x (5a - 2b) = 25a^2 - 10 ab
and -2b(5a - 2b = -10ab --4 b^2
which goes to 25 a^2 -20ab + 4b^2

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!

I get
25a^2-20ab+4b^2
which looks a lot like your answer.