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The vertex of this parabola is at [tex]\((-3, 2)\)[/tex]. Which of the following could be its equation?

A. [tex]\(y=4(x-3)^2+2\)[/tex]

B. [tex]\(y=4(x-3)^2-2\)[/tex]

C. [tex]\(y=4(x+3)^2+2\)[/tex]

D. [tex]\(y=4(x+3)^2-2\)[/tex]

Sagot :

Certainly! Let's analyze the problem step-by-step.

We are given that the vertex of a parabola is at [tex]\((-3, 2)\)[/tex]. The general form for a parabola's vertex form is given by:

[tex]\[ y = a(x - h)^2 + k \][/tex]

where [tex]\((h, k)\)[/tex] is the vertex of the parabola. Here, [tex]\( h = -3 \)[/tex] and [tex]\( k = 2 \)[/tex].

Substituting the vertex into the formula, we get:

[tex]\[ y = a(x + 3)^2 + 2 \][/tex]

Now, we need to identify which of the given options match this form. Let’s examine each option:

Option A: [tex]\( y = 4(x - 3)^2 + 2 \)[/tex]

- Here, the equation is [tex]\( y = 4(x - 3)^2 + 2 \)[/tex]. The vertex for this form is [tex]\( (3, 2) \)[/tex], which does not match our given vertex [tex]\((-3, 2)\)[/tex]. Therefore, this option is incorrect.

Option B: [tex]\( y = 4(x - 3)^2 - 2 \)[/tex]

- Here, the equation is [tex]\( y = 4(x - 3)^2 - 2 \)[/tex]. The vertex for this form is [tex]\( (3, -2) \)[/tex], which also does not match our given vertex [tex]\((-3, 2)\)[/tex]. Therefore, this option is incorrect.

Option C: [tex]\( y = 4(x + 3)^2 + 2 \)[/tex]

- Here, the equation is [tex]\( y = 4(x + 3)^2 + 2 \)[/tex]. The vertex for this form is [tex]\((-3, 2) \)[/tex], which matches our given vertex. Therefore, this option is correct.

Option D: [tex]\( y = 4(x + 3)^2 + 2 \)[/tex]

- Here, the equation is [tex]\( y = 4(x + 3)^2 + 2 \)[/tex]. The vertex for this form is also [tex]\((-3, 2) \)[/tex], which matches our given vertex. Therefore, this option is correct as well.

In conclusion, the equations that could correspond to a parabola with the vertex at [tex]\((-3, 2)\)[/tex] are given in options [tex]\(C\)[/tex] and [tex]\(D\)[/tex].