# What is the answer of (13r-a)square

2
by naleicute06

## Answers

2014-12-13T14:31:48+08:00

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2014-12-13T20:07:35+08:00

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(13r-a)^2?
Just think of it that it is like this:
13-squared x r-squared  -a-squared
169  x r-squared  a-squared
=169r^2+a^2
Now, WHY DID -a-squared become positive a-squared?
Answer: Given -3-squared:
We all know that -3-squared is 9.
But, it is just the same with 3-squared and both of them yields 9.
So, simple, we just simplified it, done!

I am not sure but something on my mind tells me that my answer is wrong. Can a professional please review this because I am not sure, but I think that the answer would be: 16ar^2 - 26ar + a^2. Can the moderator please make things clearer!