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Group the terms of the equation by moving the terms that have the variable $x$ to the left side, and those that do not have it to the right side
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$x^2-4x=5-4$
Learn how to solve problems step by step online. Solve the equation x^2-4x+4=5. Group the terms of the equation by moving the terms that have the variable x to the left side, and those that do not have it to the right side. Subtract the values 5 and -4. Factor the polynomial x^2-4x. Add and subtract \left(\frac{b}{2}\right)^2, replacing b by it's value -4. Now, we can factor x^2+-4x+4 as a squared binomial of the form \left(x+\frac{b}{2}\right)^2.