E(x)=(2x-1)(2x+1)/x(2x-1)·3(2x+1)/2(4x²-1) simplificam
E(x)=(2x+1)/x·3(2x+1)/2(2x-1)(2x+1) simplificam
E(x)=3(2x+1)/2x(2x-1)
a)E(x)=3/2x
3(2x+1)/2x(2x-1)=3/2x
(6x+3)/(4x²-2x)=3/2x
3·2x(2x+1)=3(4x²-2x)
12x²+6x=12x²-6x
12x²-12x²+6x+6x=0
12x=0
x=0
b)E(x)=3
3(2x+1)/2x(2x-1)=3
6x+3=3·2x(2x-1)
6x+3=12x²-6x
-12x²+6x+6x+3=0
-12x²+12x+3=0 ·(-3)
4x²-4x-1=0
(2x-1)(2x+1)=0
2x-1=0⇒ X1=1/2
2x+1=0⇒ X2=-1/2