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2x² - 72 =0
2(x²-36)=0
2(x-6)(x+6)=0
(x-6)(x+6)=0
-->x-6=0
x1=6
-->x+6=0
x2= -6
Comprobando:
2(6)²=72
2(-6)²=72
------------------------------------
3x²=12
3x² - 12 =0
3(x²-4)=0
3(x-2)(x+2)=0
(x-2)(x+2)=0
-->x-2=0
x1=2
-->x+2=0
x2= -2
Comprobando:
2(2)²=12
2(-2)²=12
x²=72/2 x²=12/3
x²=36 x²=4
√x²=√36 √x²=√4
x=6 x=2
.............Kd