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kittenalexis68
06.02.2021 •
Mathematics
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Ответ:
1. y=ax^2+bx+c, where a,b, and c are real numbers and a doesn't equal zero
2. Parabola
3. Opens upward
4. Opens downward
5. Vertex
6. Axis of Symmetry
7. Zeros, roots, or x-intercepts
8. You are already given the function so
Step 1: FInd Axis of Symmetry
Equation for Axis of Symmetry: x= - b/2a
Step 2: Find Vertex
- The vertex will be on the Axis of Symmetry, so plug in x then find y.
Equation for Vertex: Ex. The vertex is (-5) which is x now we find y by plugging in -5 whenever we see an X. f(x) = -(-5)^2 - 10(-5)-25=0 our vertex would be (-5,0)
Step 3: Draw your coordinates plane and "dash in" the axis of symmetry. Then plot your vertex
Step 4: Plot your y-intercept and the point symmetrical to it. The y-intercept is "c"
Step 5: Find at least other point on the parabola and draw the curve.
Ответ:
Step-by-step explanation:
we know that
The ellipse has directrices at > given
The directrices has equation:
where e is the eccentricity of the ellipse.
so
> equation A
Remember that the foci are given by:
In this problem
The foci are at (0,2) and (0,-2)
so
> equation B
Solve the system of equations A and B
substitute equation A in equation B
Find the value of a
We know,
Substituting the values, we get
The equation of the ellipse is given by:
we have
substitute
therefore
x squared over 4 plus y squared over 8 equals 1