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Y_Kistochka [10]
1 year ago
15

How do you solve x2 – 4 = 5 by graphing the related function

Mathematics
1 answer:
vova2212 [387]1 year ago
5 0

Answer:

  see attached

Step-by-step explanation:

The related function we like to graph is the one that has the solutions as its zeros.

__

Subtract 5 from both sides.

  x² -9 = 0

This is now in the form ...

  f(x) = 0

The related function is then ...

  f(x) = x² -9

and its zeros are the solutions to the original equation. The zeros (x-intercepts) of f(x) are x = -3 and x = 3.

__

<em>Additional comment</em>

The second attachment shows a graph of the given equation. Essentially, its graph is two points on the number line: x = -3 and x = 3.

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Step-by-step explanation:

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1 year ago
find the perimeter of an isosceles triangle with side lengths of 5+x, 5+x, and xy. Write in simplest form.
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The like terms 5 and 5 add to 10. The other pair of like terms x and x add to 2x. There isn't anything to pair with xy, so we leave it as is.

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Translate question into an equation, let x be unknown number 6.4 is 90% of what number?
lisov135 [29]
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Answer:

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Step-by-step explanation:

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