The first step for deriving the quadratic formula from the quadratic equation, 0 = ax^2 + bx + c, is shown. Step 1: –c = ax^2 + bx

Which best explains or justifies Step 1?

subtraction property of equality
completing the square
factoring out the constant
zero property of multiplication

Subtraction property of equality

Step-by-step explanation:

You subtracted c from both sides of the equation to preserve equality

step-by-step explanation:

. your answer will contain x - and y -terms. (1 point) x ( ¿¿ 2 − 7 ) 2 +( y 2 − 9 ) 2 √ ¿ 12. what is the distance from the directrix (the crocodile river) to the point ( x , y )? write this equation. your answer will contain a y -term.