Question

I need help please it so confusing can somebody anyone break it down ​

Answer 1

`a=√(63)`

Explanation:

When we solve for this we should always remember this formula
`a^2+b^2=c^2` and since we already know b and c we can plug that in tho find out what a could be but we won't actually solve it.

`a^2+b^2=c^2\\a^2+9^2=12^2\\a^2+81=144\\a^2=63\\√(a^2)=√(63)`

So a would equal whatever the square root of 63 is.