Which function is a quadratic function? c(x) = 6x + 3x3 d(x) = x – 8x4 p(x) = –5x – x2 k(x) = 2x2 + 9x4
2 answers:
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Answer:
Step-by-step explanation:
The standard form for the equation of a circumference is:
Where:
(a, b) is the center of the circumference
r is the radius
In this problem we have the equation of the following circumference, and we want to convert it to the standard form:
The first thing we must do to transform this equation into the standard form is to use the square completion technique.
The steps are shown below:
1. Group all the same variables:
2. Take the coefficient that accompanies the variable x. In this case the coefficient is -8. Then, divide by 2 and the result elevate it to the square.
We have:
Then do the same for the coefficient that accompanies the variable y
3. Add on both sides of the equality the terms obtained in the previous step:
4. Factor the resulting expression, and you will get:
Write the equation in the standard form:
Then, the center is the point (4, -3) and the radius is r = 3.
Observe the attached image
