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4x^{2}-4x+1-4\left(x^{2}+3\right)>0
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-1\right)^{2}.
4x^{2}-4x+1-4x^{2}-12>0
Use the distributive property to multiply -4 by x^{2}+3.
-4x+1-12>0
Combine 4x^{2} and -4x^{2} to get 0.
-4x-11>0
Subtract 12 from 1 to get -11.
-4x>11
Add 11 to both sides. Anything plus zero gives itself.
x<-\frac{11}{4}
Divide both sides by -4. Since -4 is negative, the inequality direction is changed.