The Quadratic Formula Answers
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1
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Which equation has the solutions ?
A
2x2 + 6x + 9 = 0B
x2 + 3x + 12 = 0C
x2 + 3x + 3 = 0D
2x2 + 6x + 3 = 02
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Which equation shows the quadratic formula used correctly to solve 7x2 = 9 + x for x?
A
x = StartFraction negative 1 plus-or-minus StartRoot (negative 1) squared minus 4 (7) (9) EndRoot Over 2 (7) EndFraction
B
x = StartFraction 1 plus-or-minus StartRoot (negative 1) squared minus 4 (7) (9) EndRoot Over 2 (7) EndFraction
C
x = StartFraction negative 1 plus-or-minus StartRoot (negative 1) squared +4 (7) (9) EndRoot Over 2 (7) EndFraction
D
x = StartFraction 1 plus-or-minus StartRoot (negative 1) squared +4 (7) (9) EndRoot Over 2 (7) EndFraction
3
Which equation has the solutions ?
A
x2 + 2x + 4 = 0B
x2 – 2x + 4 = 0C
x2 + 2x – 4 = 0D
x2 – 2x – 4 = 04
Using the quadratic formula to solve x2 = 5 – x, what are the values of x?
A
StartFraction negative 1 plus-or-minus StartRoot 21 EndRoot Over 2 EndFraction
B
StartFraction negative 1 plus-or-minus StartRoot 19 EndRoot i Over 2 EndFraction
C
StartFraction 5 plus-or-minus StartRoot 21 EndRoot Over 2 EndFraction
D
StartFraction 1 plus-or-minus StartRoot 19 EndRoot i Over 2 EndFraction
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