How do you solve x2 – 4 = 5 by graphing the related function
1 answer:
Answer:
see attached
Step-by-step explanation:
The related function we like to graph is the one that has the solutions as its zeros.
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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.
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<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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