The Quadratic Formula Answers
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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
2
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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
3
What is the discriminant of ?
A
76B
94C
106D
1244
Which equation can be solved using the expression for x?
A
10x2 = 3x + 2B
2 = 3x + 10x2C
3x = 10x2 – 2D
10x2 + 2 = –3x5
If the discriminant of a quadratic equation is equal to , which statement describes the roots?
A
There are two complex roots.B
There are two real roots.C
There is one real root.D
There is one complex root.6
What is the discriminant of 9x2 + 2 = 10x?
A
–356B
–172C
28D
727
Which equation has the solutions ?
A
2x2 + 6x + 9 = 0B
x2 + 3x + 12 = 0C
x2 + 3x + 3 = 0D
2x2 + 6x + 3 = 0Did you find these answers helpful?
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