Solve by the quadratic formula. Simplify answers. Use i notation for nonreal complex numbers.x2 = 4x - 7
A. x = 2 ± i
B. x = -2 ± i
C. x = 2 ± 3i
D. x = 2 ± 
Answer: A
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Simplify the expression.
+ 
A. 
B. 
C. 
D. 
Sketch the graph of the function.
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A. ?
B. ?
C. ?
D. ?
E. ?
Solve.While traveling at a constant speed in a car, the centrifugal acceleration passengers feel while the car is turning is inversely proportional to the radius of the turn. If the passengers feel an acceleration of 4 feet per second per second when the radius of the turn is 40 feet, find the acceleration the passengers feel when the radius of the turn is 80 feet.
A. 2 feet per second per second B. 4 feet per second per second C. 3 feet per second per second D. 5 feet per second per second
Find the focus and directrix of the parabola with the given equation.y2 = -28x
A. focus: (7, 0) directrix: x = -7 B. focus: (-7, 0) directrix: y = 7 C. focus: (-7, 0) directrix: x = 7 D. focus: (0, -7) directrix: y = 7