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# parabola open upward or downward

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Solve the 2 problems. Show your work.
1. y = x ^2 - 4x -12
a) What is the vertex?
b) What are the intercepts?
c) Does the parabola open upward or downward?

2. y = -x^2 + 2x +3
a) What is the vertex?
b) What are the intercepts?
c) Does the parabola open upward or downward?

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#### Solution Preview

Solve the 2 problems. Show your work.
1. y = x ^2 - 4x -12
a) What is the vertex?
Vertex will be at x = -b/2a = -(-4)/2 = 2
y = 2^2 - 4*2 - 12 = 4 - 8 - 12 = -16
vertex = (2, -16)

b) What are the intercepts?
X -intercept
Put y = 0
x ^2 ...

#### Solution Summary

The parabola as open upward or downward is discussed.

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