Question

Find the length of the missing side

Answer 1

Use the Pythagorean theorem:

$x^2+24^2=25^2\\\\x^2+576=625\ \ \ \ |-576\\\\x^2=49\to x=\sqrt{49}\to\boxed{x=7}$

Answer 2

a^2+b^2=c^2

a^2+24^2=25^2

a^2+576=625

a^2=49

a=7

The answer is 7.