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4x²=100
x² =100/4
x² =25
x = √25
x = 5
x = -5
tenemos.
(2x)^2=100
4x^2=100
4x^2-100=0
dividimos por el numero que acompaña a x^2 asi:
4x^2/4=100/4
x^2=25
x^2=25
√x^2=√25
x=5=>respuesta
verificamos:
(2x)^2=100
(2(5)^2=10
(10)^2=100
100=100
igualdad verdadera
espero ayude