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Expand the expression $\left(2x+3\right)^2$ using the square of a binomial: $(a+b)^2=a^2+2ab+b^2$
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$4x^{2}+12x+9-4\left(x-1\right)\left(x+3\right)=x^2$
Learn how to solve quadratic equations problems step by step online. Solve the quadratic equation (2x+3)^2-4(x-1)(x+3)=x^2. Expand the expression \left(2x+3\right)^2 using the square of a binomial: (a+b)^2=a^2+2ab+b^2. Grouping all terms to the left side of the equation. Combining like terms 4x^{2} and -x^2. Multiply the single term -4\left(x+3\right) by each term of the polynomial \left(x-1\right).