Question

What is the equation of the parabola in vertex form?
0=y^2-x+2y-3

Answer 1

complete the square for y
y^2 + 2y + 1 = (y + 1)^2
Can you do the rest?

Answer 2

so
0 = (y + 1)^2 - x - 4
and then..

Answer 3

why -4?

Answer 4

Because we added an extra minus 1 to complete the square so we need to subtract it to keep the equality

Answer 5

sorry plus one

Answer 6

oh ok so then it would be C because -x-4 are left right?

Answer 7

The last step is to move -x -4 to the left hand side. What is C?

Answer 8

C is (x+4)=(y+1)^2
i posted the options as a pic sorry

Answer 9

Yep, sounds good. Find a couple x,y pairs with the new equation and see if they solve what you were given originally, just to check your work.

Answer 10

cool thanks!

Answer 11

yw