Solving Quadratic Equations

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Section 10.4

• Solving Quadratic Equations

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Graphing Quadratic Equations
Plug in values for x to find y
x2 4 y
(-2, 0)
(2, 0)
(0, -4)
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OR we can solve for x

• x2 1 0

2x2 98 0
x2 16 0
x2 1
2x2 98
x2 16
vx2 v 1
vx2 v 49
vx2 v 16
x 1 or -1
x 7 or -7
x 4 or -4
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Lets look at a few more

• x2 18 0

1/3x2 3 0
4x2 0
x2 18
1/3x2 -3
x2 0
vx2 v 18
vx2 v -9
vx2 v 0
x v18 or -v18
x 0
No Solution
5
You Try

• k2 81 0
• c2 25 0
• 6w2 24 0
• x2 7 23

k 9 , -9 c No Solution w 2, -2 x 4,
-4