The Quadratic Formula Answers
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1
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Which equation has the solutions ?
A
x2 + 2x + 4 = 0B
x2 – 2x + 4 = 0C
x2 + 2x – 4 = 0D
x2 – 2x – 4 = 02
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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 could generate the curve in the graph below?
A
y = 3x2 – 2x + 1B
y = 3x2 – 6x + 3C
y = 3x2 – 7x + 1D
y = 3x2 – 4x – 24
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.Did you find these answers helpful?
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