The first step for deriving the quadratic formula from the quadratic equation, 0 = ax2 bx c, is shown. step 1: –c = ax2 bxwhich best explains or justifies step 1? a. subtraction property of equalityb. completing the squarec. factoring out the constantd. zero property of multiplication

In deriving the quadratic formula from the equation 0=ax^2+bx+c where the first step is -c=ax^2+bx, subtraction property of equality best justifies step one. It states that when you subtract the same number in both sides of the equation, the expressions on both sides remain equal. In this case, we subtracted c from both sides resulting to the equation -c=ax^2+bx.