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faust18 [17]
3 years ago
14

What is the vertex of m(x) = -2(x-3)(x-9)

Mathematics
1 answer:
kvv77 [185]3 years ago
3 0

Answer:

Vertex: (6, 18)

Step-by-step explanation:

Given the quadratic function, m(x) = -2(x - 3)(x - 9):

Perform the FOIL method on the two binomials, (x - 3)(x - 9) without distributing -2:

m(x) = -2[(x - 3)(x - 9)]

Combine like terms:

m(x) = -2(x² - 9x - 3x + 27)

m(x) = -2(x² - 12x + 27)

where: a = 1, b = -12, and c = 27

Since the <u>axis of symmetry</u> occurs at <em>x</em> = <em>h</em>, then we can use the following formula to solve for the x-coordinate (<em>h </em>) of the vertex, (h, k):

x = \frac{-b}{2a}

Substitute a = 1 and b = -12 into the formula:

x = \frac{-b}{2a}

x = \frac{-(-12)}{2(1)} = \frac{12}{2} = 6

Therefore, the x-coordinate (h) of the vertex is 6.  

Next, substitute the value of <em>h</em> into x² - 12x + 27 to find the y-coordinate (<em>k </em>) of the vertex:

<em>k </em> = x² - 12x + 27

<em>k </em> = (6)² - 12(6) + 27

<em>k </em>= 36 - 72 + 27

<em>k</em> = 18

Therefore, the <u>vertex</u> of the quadratic function occurs at point (6, 18), in which it is the maximum point on the graph.

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