For Exercises 59–64, use the standard form of a parabola given by y = a x 2 + b x + c to write an equation of a parabola that passes through the given points. (See Example 5.) ( 1 , 4 ) , ( − 1 , 6 ) , and ( 2 , 18 )
For Exercises 59–64, use the standard form of a parabola given by y = a x 2 + b x + c to write an equation of a parabola that passes through the given points. (See Example 5.) ( 1 , 4 ) , ( − 1 , 6 ) , and ( 2 , 18 )
Solution Summary: The author calculates the equation of the parabola which passes through the given points (1,4),.
For Exercises 59–64, use the standard form of a parabola given by
y
=
a
x
2
+
b
x
+
c
to write an equation of a parabola that passes through the given points. (See Example 5.)
In Exercises 35–42, find the vertex, focus, and directrix of each
parabola with the given equation. Then graph the parabola.
35. (x – 2) = 8(y – 1)
37. (x + 1) = -8(y + 1)
39. (y + 3) = 12(x + 1)
41. (y + 1) = -&r
36. (x + 2) = 4(y + 1)
38. (x + 2) = -8(y + 2)
40. (y + 4)2 = 12(x + 2)
%3D
%3D
42. (y - 1) = -&r
In Exercises 5–12, find the standard form of the equation of each
hyperbola satisfying the given conditions.
5. Foci: (0, –3), (0, 3); vertices: (0, –1), (0, 1)
6. Foci: (0, –6), (0, 6); vertices: (0, -2), (0, 2)
7. Foci: (-4, 0), (4, 0); vertices: (-3, 0), (3,0)
8. Foci: (-7, 0), (7, 0); vertices: (-5, 0), (5,0)
9. Endpoints of transverse axis: (0, -6), (0, 6); asymptote:
y = 2x
10. Endpoints of transverse axis: (-4,0), (4, 0); asymptote:
y = 2r
11. Center: (4, -2); Focus: (7, -2); vertex: (6, -2)
12. Center: (-2, 1); Focus: (-2, 6); vertex: (-2, 4)
In Exercises 85–88, find the vertex for each parabola. Then
determine a reasonable viewing rectangle on your graphing
utility and use it to graph the quadratic function.
85. y = -0.25x² + 40x
86. y = -4x? + 20x + 160
87. y = 5x² + 40x + 600
88. y = 0.01x² + 0.6x + 100
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