11the first step for deriving the quadratic formula from the quadratic equation, 0 = ax2 + bx + c, is shown. step 1: –c = ax2 + bx which best explains or justifies step 1? subtraction property of equality completing the square factoring out the constant zero property of multiplication

Quadratic equation is of the form

And to derive quadratic formula from quadratic equation, we need to get rid of c from right side and move it to left side .

And for that, we have to subtract c to both sides, that is

And since we do subtraction, so we have used subtraction property here.

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