Question

Select the correct first step for finding the y-coordinate of the vertex of the equation y=-x^2+4x+3, if the x-coordinate is 2.

A) -1(1/2)^2+4(1/2)+3
B) -1(2)^2+4(2)+3
C) -1/2
D) -(1/4)+(4/2)+3

Answer 1

C this is why , go to this link and it will show you it step by step :D - http://www.algebra.com/algebra/homework/quadratic/Quadratic_Equations.faq.question.176546.html

Answer 2

That's the last step.