Question

Consider the quadratic equation x^2 = 4x-5. How many solutions does the equation have?

A. The equation has one real solution.

B. The equation has two real solutions.

C. The equation has no real solutions.

D. The number of solutions cannot be determined.
Answer
An astronaut drops a rock into a crater on the moon. The distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t) = 0.8t^2. What is the average speed, in meters per second, of the rock between 5 and 10 seconds after it was dropped?
Answer
What are the roots of the equation x^2+6x-9=0?

A. 3±6√2

B. -3±6√2

C.3±3√2

D.-3±3√2
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