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Evgesh-ka [11]
3 years ago
7

Use the parabola tool to graph the quadratic function f(x)=−x2+4. Graph the parabola by first plotting its vertex and then plott

ing a second point on the parabola.
Mathematics
1 answer:
Agata [3.3K]3 years ago
3 0

Answer:

see below

Step-by-step explanation:

f(x) = -x^2 +4

The vertex form is

y = a(x-h)^2 +k

Rewriting

f(x) = -(x-0)^2 +4

The vertex is (0,4) and a = -1

Since a is negative we know the parabola opens downward

f(x) = -(x^2 -4)

We can find the zeros

0 = -(x^2 -2^2)

This is the difference of squares

0 = -(x-2)(x+2)

Using the zero product property

x-2 =0   x+2 =0

x=2   x=-2

(2,0)  (-2,0) are the zeros of the parabola and 2 other points on the parabola

We have the maximum ( vertex) and the zeros and know that it opens downward, we can graph the parabola

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3 years ago
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Marina86 [1]
See the attached picture to better understand the problem
we know that
in rectangle ABCD 
AB=CD
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therefore
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the answer part a) is
BD= 8 units

Part b) Find angle CBD

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