The Quadratic Formula Answers
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1
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When deriving the quadratic formula by completing the square, what expression can be added to both sides of the equation to create a perfect square trinomial?
A
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B
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C
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D
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2
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Which equation shows the quadratic formula used correctly to solve 5x2 + 3x – 4 = 0 for x?
A
x = StartFraction negative 3 plus-or-minus StartRoot (3) squared minus 4 (5) (negative 4) EndRoot Over 2 (5) EndFraction
B
x = StartFraction 3 plus-or-minus StartRoot (3) squared + 4 (5) (negative 4) EndRoot Over 2 (5) EndFraction
C
x = StartFraction 3 plus-or-minus StartRoot (3) squared minus 4 (5) (negative 4) EndRoot Over 2 (5) EndFraction
D
x = StartFraction negative 3 plus-or-minus StartRoot (3) squared + 4 (5) (negative 4) EndRoot Over 2 (5) EndFraction
3
Which equation has the solutions ?
A
x2 + 2x + 4 = 0B
x2 – 2x + 4 = 0C
x2 + 2x – 4 = 0D
x2 – 2x – 4 = 04
Which equation has the solutions ?
A
3x2 – 5x + 7 = 0B
3x2 – 5x – 1 = 0C
3x2 – 10x + 6 = 0D
3x2 – 10x – 1 = 05
What is the discriminant of ?
A
76B
94C
106D
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