Please help me find the missing side thanks and explain!

Answer:
7
Step-by-step explanation:
We can look at the missing side as part of a right triangle
We have 24 as one side and 25 as the hypotonouse
we have
24²+x²=25²
solve for x
25²-24²=49
x²=49
x= ±7
but it obviously can't be negative so x=7