That is basically squaring both sides of the equation.
When you cracked open an egg of somethingike this (a+b)2You may end up like something like:(the dots don't matter)
..____.....____
\/ a = \2/ 2
And you can remove them.
a = 8
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By using the quadratic equation formula
Square
By using the quadratic equation formula or by completing the square
When you graph the quadratic equation, you have three possibilities... 1. The graph touches x-axis once. Then that quadratic equation only has one solution and you find it by finding the x-intercept. 2. The graph touches x-axis twice. Then that quadratic equation has two solutions and you also find it by finding the x-intercept 3. The graph doesn't touch the x-axis at all. Then that quadratic equation has no solutions. If you really want to find the solutions, you'll have to go to imaginary solutions, where the solutions include negative square roots.
To find the solution to this equation, you need to rearrange the terms and solve for the variable. 4 = 2b + b^2 can be rewritten as b^2 + 2b - 4 = 0. You can then solve this quadratic equation by factoring, completing the square, or using the quadratic formula.