The 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?
a. subtraction property of equality
b. completing the square
c. factoring out the constant
d. zero property of multiplication

Option a is correct

Subtraction property of equality

Step-by-step explanation:

Given the quadratic equation:

         .....[1]

Subtraction property of equality states that you subtract the same number to both sides of an equation.

Subtract c from both sides in [1] we have;

Simplify:

Therefore, the step 1 justifies the subtraction property of equality

i'm not sure i quite understand, could you provide more information?

29 is the correct answer

step-by-step explanation: