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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.

(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!

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!