Lesson 6: The Quadratic Formula Answers
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1
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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
2
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Which equation could generate the curve in the graph below?
A
y = 3x2 – 2x + 1B
y = 3x2 – 6x + 3C
y = 3x2 – 7x + 1D
y = 3x2 – 4x – 23
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
mc030-2.jpg
B
mc030-3.jpg
C
mc030-4.jpg
D
mc030-5.jpg
4
If x = –3 is the only x-intercept of the graph of a quadratic equation, which statement best describes the discriminant of the equation?
A
The discriminant is negative.B
The discriminant is –3.C
The discriminant is 0.D
The discriminant is positive.5
Which equation has the solutions ?
A
x2 + 2x + 4 = 0B
x2 – 2x + 4 = 0C
x2 + 2x – 4 = 0D
x2 – 2x – 4 = 0Did you find these answers helpful?
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