Question

Teorema de pitagoras
h=20
c= 4x
c=3x
obs: formula: a²=b²+c²

Answer 1

20^2=(4x)^2+(3x)^2

400=16x^2+9x^2
400=25x^2
400/25=x^2
16=x^2
x1= +4
x2= -4