If the IRS had discovered the quadratic formula
Who Can Use Form QF?
You can use Form QF if all of the following apply.
• You need to solve an equation of the form Ax2 + Bx + C = 0.
• A is not equal to zero .
Form QF
1 Enter A here. If line 1 is zero ,
stop. You cannot use Form QF. . . |
1 |
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2 Enter B here . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . |
2 |
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3 Enter C here. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . |
3 |
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4a Do you have evidence to support
your values of A , B, and C?. . . . . . . . . |
Yes
No |
b If “Yes,” is the evidence written?
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. |
Yes
No |
5 Multiply line 1 by 2 . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . |
5 |
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6 Divide line 2 by line 5. . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. |
6 |
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7 Multiply line 6 by −1 . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
7 |
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8 Multiply line 3 by line 5 . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
8 |
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9 Amount from line 2 . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. |
9 |
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10 Multiply line 2 by line 9 . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
10 |
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11 Multiply line 8 by 2 . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . |
11 |
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12 Subtract line 11 from line 10. If
line 11 is more than line 10, leave |
12 |
|
blank and fill out Negative
Discriminant Worksheet . . . . . . . . . . . . . |
13 If amount on line 12 is zero ,
enter amount from line 7 on line 15, |
13 |
|
write “Dbl Rt” in space to left of
line 15, and leave line 16 blank. |
Otherwise, take square root of amount
on line 12. Check if square |
root is from : a
Square root tables b
Calculator . . . . . . . . . . |
14 Divide line 13 by line 5 . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
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15 Root 1: Add lines 7 and 14 . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
15 |
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16 Root 2: Subtract line 14 from line
7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
16 |
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Negative Discriminant Worksheet
1 Amount from Form QF line 5 . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
1 |
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2 Amount from Form QF line 7 . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
2 |
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3 Amount from Form QF line 11 . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3 |
|
4 Amount from Form QF line 10 . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
4 |
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5 Subtract line 4 from line 3 . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
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6 Take square root of line 5. Check
if square root is from: |
6 |
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a
Square root tables b Calculator . .
. . . . . . . . . . . . . . . . . . . . . . |
7 Divide line 6 by line 1. . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. |
7 |
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8 Write amount from line 2, a plus
sign , amount from line 7, and |
8 |
|
the letter “i”. Enter here and on
Form QF line 15. . . . . . . . . . . . . . . |
9 Write amount from line 2, a minus
sign, amount from line 7, and |
9 |
|
the letter “i”. Enter here and on
Form QF line 16. . . . . . . . . . . . . . . |
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