What is the square root method and the completing the square

Completing the square is used to change a binomial of the form x2 + bx into a perfect square trinomial , which can be factored to . When solving quadratic equations by completing the square, be careful to add to both sides of the equation to maintain equality. The Square Root Property can then be used to solve for x

The correct answer is -20y

The year before the 10s so it was like when caveman were alive