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mixas84 [53]
2 years ago
9

Find the zeros of the following function, and plot them on the graph.

Mathematics
2 answers:
ElenaW [278]2 years ago
8 0

Answer:

The zeros are -6, -4, 3 and 4

Step-by-step explanation:

In order to find the zeros of a function we have to:

  • Set the function equal to 0
  • Factor it
  • Set each one of the factors equal to 0
  • Solve for x for each one of those factors.

Finding the zeros.

We can start setting the function equal to 0

f(x) = 0

For this exercise we have

(x^2-16)(x^2+3x-18)=0

Then we can factor each parenthesis.

For the first one we have a difference of squares, so we can use a^2-b^2 =(a-b)(a+b), which will give us

(x-4)(x+4)(x^2+3x-18)=0

For the last parenthesis, we need to think of a couple of numbers that multiplied give us the last number which is -18 and the sum give us the middle coefficient which is +3, those numbers are +6 and -3, since +6*(-3) = -18 and their sum give us 3.

(x-4)(x+4)(x+6)(x-3)=0

Then we can set each one of those factors equal to 0.

x-4=0,        x+4=0,     x+6=0, x-3=0

So we  can solve for x for each, which will give us

x=4, x= -4, x = -6, x = 3

Thus the zeros are -6, -4, 3, 4.

And we can plot them as you can see on the attached image, just click on dots and select (-6,0), (-4,0), (3,0) and (4,0). The sketch will look like the following image.

Svetlanka [38]2 years ago
3 0
The zeros are (x+4)(x-4)(x+6)(x-3).
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