X2 - 4x + y2 - 21 = 0 The equation in standard form is
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Since this is a right triangle, we can use our trigonometric functions to solve for x.
Since we know the adjacent side and hypotenuse, we will use cosine.
Based on the function
, we can solve for x. The adjacent side is 7 and the hypotenuse is 12. Plugging this in, we get 
.
Now, we must use our inverse trigonometric functions to solve for x:
The inverse cosine and cosine on the left side cancel, leaving you with:
Since we know the adjacent side and hypotenuse, we will use cosine.
Based on the function
Now, we must use our inverse trigonometric functions to solve for x:
The inverse cosine and cosine on the left side cancel, leaving you with: