Plsss dau coroana si puncte, e urgent!! b si c va rogg

25^2-x^2=7^2
625-x^2=49
x^2=625-49=576
x=rad576=24
13+2X^2=x^2-12
2x^2-x^2=-12-13
2x^2-x^2=-25
x^2=-25
x=rad-25=+sau- 5