Question

A student is deriving the quadratic formula. Her first two steps are shown.

Step 1: –c = ax2 + bx

Step 2:

Which best explains or justifies Step 2?

division property of equality
factoring the binomial
completing the square
subtraction property of equality

Answer 1

Division property of equality — both sides were divided by a to get x^2 + (b/a)x = -c/a.