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 2 years ago
Write the equation of the parabola in vertex form.
A.
y = (x + 1)2 + 3
B.
y = (x + 1)2 – 3
C.
y = (x – 1)2 – 3
D.
y = (x – 1)2 + 3
 2 years ago
Write the equation of the parabola in vertex form. A. y = (x + 1)2 + 3 B. y = (x + 1)2 – 3 C. y = (x – 1)2 – 3 D. y = (x – 1)2 + 3

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selenamalter
 2 years ago
Best ResponseYou've already chosen the best response.0thats the wrong graph

ZeHanz
 2 years ago
Best ResponseYou've already chosen the best response.1Do you see the zeroes at 1 and 4? The vertex is right in the middle of them: x = 1½. Also the ycoordinate of the vertex seems to be 7½. I cannot match it...

selenamalter
 2 years ago
Best ResponseYou've already chosen the best response.0hold on let me get the other one

ZeHanz
 2 years ago
Best ResponseYou've already chosen the best response.1What are the coordinates of the vertex?

ZeHanz
 2 years ago
Best ResponseYou've already chosen the best response.1No, you have to go to the left and down... I get (1, 3).

ZeHanz
 2 years ago
Best ResponseYou've already chosen the best response.1So if you look at the answer options, that doesn't help much: these same numbers are in every option, sometimes + sometimes ... You can find the right one by comparing this graph with that of the "father of all parabolas": y = x². That one has a vertex in (0, 0). So if x = 0, you get the other coodrinate of the vertex (also 0). In your parabola, you have to set x = 1 to get the vertex, so you get (x+1)² in the formula.

ZeHanz
 2 years ago
Best ResponseYou've already chosen the best response.1That would be all, if the ycoordinate of the vertex was at y = 0, just as the vertex of y = x². But this isn't the case, it lies 3 units lower! OK, just subtract 3 from the formula, result: y = (x+1)²3

ZeHanz
 2 years ago
Best ResponseYou've already chosen the best response.1You added 3, which would make the parabola go 3 units up, instead of down...

selenamalter
 2 years ago
Best ResponseYou've already chosen the best response.0okay, thank so much for all your help :D

ZeHanz
 2 years ago
Best ResponseYou've already chosen the best response.1YW! Hope you understand the principle of moving the parabola.
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