Answers:
where 'a' cannot be zero.
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Explanation:
The vertex is (h,k)
The x coordinate of the vertex is h which is found through this formula
For example, if we had the quadratic , then we'll plug in a = 3 and b = -6 to get:
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To find the value of k, we plug that h value into the original standard form of the quadratic and simplify.
It's interesting how we end up with the numerator of which is similar to found under the square root in the quadratic formula. There are other ways to express that formula above. We need to avoid dividing by zero. The values of b and c are allowed to be zero.
The measure of DE = 90 degrees because its corresponding central angle = 90 degrees.
An educated guess or a estimation
The answer is -1/3. So easy
Let's thing a little bit...
we have...
8
14
21
29
Can you see it now?!
so