MA 153
Lesson 28 Outline
Quiz Solutions (Practice problems for distance learning students)
1.
Find the maximum or minimum value (specify whether it is a max or a min):
(
)
2
2
3
y
x
=
−
−
5
Min value = -5
(It is a min because “a” is positive so parabola opens up and
the min/max is the y-coordinate of the vertex.
2.
A stone is skipped in the shape of a parabola.
During one hop, the stone went a
horizontal distance of 6 feet and the maximum height was 4 feet.
Find a standard
equation of the parabola that fits this information.
(
)
2
y
a x
h
k
=
−
+
Vertex of our problem is (3,4) so
(
)
2
3
4
y
a x
=
−
+
The point (0,0) is on the parabola, so:
(
)
(
)
2
2
0
0
3
4
4
9
4
9
4
3
4
9
a
a
a
y
x
=
−
+
−
=
= −
= −
−
+
Answering of homework questions over lesson 27.
Lesson 28
Section 2.7
Inequalities using a sign chart

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