Answer:
√89
Step-by-step explanation:
This is a right triangle, so we can use Pythagorean theorem
a^2 +b^2 = c^2 where a and b are the legs and c is the hypotenuse
5^2 +8^2 = x^2
25+64 = x^2
89 = x^2
Take the square root of each side
sqrt(89) = sqrt(x^2)
sqrt(89) =x
