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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What is the discriminant of 9x2 + 2 = 10x?
A
–356B
–172C
28D
723
Using the quadratic formula to solve x2 + 20 = 2x, what are the values of x?
A
1 plus-or-minus StartRoot 21 EndRoot i
B
Negative 1 plus-or-minus StartRoot 19 EndRoot i
C
1 plus-or-minus 2 StartRoot 19 EndRoot i
D
1 plus-or-minus StartRoot 19 EndRoot i
4
Which equation could generate the curve in the graph below?
A
y = –2x2 + 3x – 5B
y = –2x2 – 4x – 2C
y = –2x2 – 16x – 28D
y = –2x2 + 6x – 285
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
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