What is the first step to solving THIS equation by completing the square?
a² + 100 + 21-0

Reflect the point (7,0) across the y-axis

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Examine the two-step equation. − 7 4 + x 4 = 2 which property of operations allows you to add the same constant term to both sides? amultiplication property of equality bdivision property of equality caddition property of equality dsubtraction property of equality