(2x-1)(2x+1)+x(x-1)=2x(x=+1)

Question

(2x-1)(2x+1)+x(x-1)=2x(x=+1)

Answer 1

4x^2 -1+x^2 -x=2x^2+2x
4x^2+x^2-x-2x^2-2x=1
3x^2-3x=1
3(x^2-x)=1
x^2-x=1/3
x^2-x-1/3=0
D=b^2 -4a*c= 1-4*1*(-1/3)=7/3

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