Jennifer made an error when converting y=x²+2x+7, to vertex form. In which step did she make the error? Explain your answer and provide the correct form of the equation in vertex form.
A. y=x²+2x+7
B. y=(x²+2x)+7
C. y=(x²+2x+1)+7
D. y=(x+1)² +7
(Will mark brainliest)

D

Step-by-step explanation:

To convert a quadratic from y = ax2 + bx + c form to vertex form, y = a(x - h)2+ k, you use the process of completing the square. Let's see an example. Convert y = 2x2 - 4x + 5 into vertex form, and state the vertex.

Below.

Step-by-step explanation:

Vertex Form:

Find the number that make the terms able to complete the square and when you get that number (the number is 1 because we need to complete the square.) then you add -1 outside of the bracket as you get -1+7 = 6

The vertex is (-1,6)

So the vertex form is actually and not +7.

(If you don't believe, use any apps to draw the graph and it'll give the vertex at (-1,6)

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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