Please help !! Geometry homework. Will mark brainliest answer !

Answer: 375
Step-by-step explanation: If the problem was pythagorean theorem. Then I hope this explantion will help.
5 squared and 20 squared. 5 squared would get you 25 and 20 squared should get you 400. Then you should take 400-25=375. Your answer therefore is 375
I hope this helped!
For this case we have to:
The Pythagorean theorem states that:
[tex]a ^ 2 + b ^ 2 = c ^ 2[/tex]
Where:
a: Base of the triangle
b: It is the height of the triangle
c: It is the hypotenuse of the triangle
We have the following information:
[tex]a = 5\\c = 20[/tex]
We must clear b:
[tex]b ^ 2 = c ^ 2-a ^ 2[/tex]
[tex]b=\sqrt{(20^2)-(5^2)}\\b=\sqrt{(400-25)}\\b=\sqrt{375}[/tex]
Simplifying the root we have:
[tex]b=\sqrt{(25*15)}\\b=5\sqrt{15}[/tex]
Thus, the height of the triangle is given by:
[tex]b = 5\sqrt{15}[/tex]
Answer:
[tex]AB = 5\sqrt{15}[/tex]