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Bananas1234
 one year ago
Where is the vertex of the parabola? y = x2 + 2x – 3 Above the xaxis Below the xaxis On the xaxis On the yaxis
Bananas1234
 one year ago
Where is the vertex of the parabola? y = x2 + 2x – 3 Above the xaxis Below the xaxis On the xaxis On the yaxis

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JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1The x coordinate of the vertex can be found by using the formula b/2a for a quadratic in standard form.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1And the y coordinate from substituting that value back in for x and solving for y.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1So, what do you get for the x coordinate of the vertex?

Bananas1234
 one year ago
Best ResponseYou've already chosen the best response.0i am stil not sure @JoannaBlackwelder

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Can you identify a, b, and c?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1ax^2 + bx + c

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1So, a is 1, b is 2, and c is 3

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Do you see how I got those numbers?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1They are the coefficients of each term in the quadratic.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1So, can you try to plug those numbers into the formula I gave?

Bananas1234
 one year ago
Best ResponseYou've already chosen the best response.0ax^2 + bx + c = 1x^2 + 2x + 3

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1So, that is the expression given in the problem. Do you see how that is the same?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1The formula I was meaning is the b/2a for the x coordinate of the vertex.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Close, 2/2*1

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1So, that simplifies to 1

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1And that is the x coordinate of the vertex. :)

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Now we need to find the y coordinate to find the specific point.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1We do that by subbing in the 1 into x into the expression.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1(1)^2 + 2(1)  3

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1See how I did that?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1:) So, what does that simplify to?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Right! So, what is the coordinate of the vertex?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Sweet. So, is that above, below, or on the axes?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1You're welcome!
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