## anonymous one year ago Solve for x.

1. anonymous

2. zzr0ck3r

Any ideas?

3. zzr0ck3r

This is a right triangle and Pythagorean theorem tells us |dw:1436843339059:dw| So you have $$5^2+8^2=x^2$$. Does this make sense?

4. zzr0ck3r

that should say, pythagorean theorem tells us $$a^2+b^2=c^2$$

5. UsukiDoll

after we figure out $5^2$ and $8^2$ we need x (or c or whatever side is missing) by itself so we need to square root both sides.

6. UsukiDoll

ok that's the c part we're missing (the longest side of the triangle-- hypotenuse)

7. anonymous

5 squared + 8 squared = x squared 25 + 64 = c squared

8. UsukiDoll

good so far..

9. UsukiDoll

so what's 25+64 ?

10. UsukiDoll

|dw:1436843685798:dw|

11. anonymous

I got 89

12. UsukiDoll

|dw:1436843762482:dw| take the square root of both sides. we need just a c...

13. UsukiDoll

draw $\sqrt{}$ on both sides you can use my drawing from above.

14. anonymous

idk how. how do you do that?

15. UsukiDoll

ok do you see that pencil on the top right hand corner of my drawing it will say "reply using drawing" click that

16. anonymous

ooh okay I got it

17. UsukiDoll

so did you figure out what c is ? hint: it should be a square root and since that number is prime...that's about it.