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1 answer:
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Multiply both the numerator and denominator by , which is called the "conjugate" of
:
Why do we pick this number? Recall the difference of squares factorization:
Now replace and
. Then
So in your fraction, you end up with
Finally, just expand the product.
Answer:
A
Step-by-step explanation:
First, we are already given the sides adjacent and opposite to ∠x. Therefore, we can use the tangent function. Recall that:
The opposite side is 20 while the adjacent side is 14.
Plug in the numbers. Use a calculator:
Edits: Improved Answer. Removed Wrong Answer.