Which value of k will make the equation 2x^2 + kx + 1 = 0 have two real solutions?

A. k = 1

B. k = -4

C. k. =2

D. k = -2

The relation h = —4.9t^2 + 120t + 3 defines the height of a rocket, where h is the height in metres and t is the time in seconds following its launch. If you want to determine how long the rocket was in flight, what must you do?

A. Determine the vertex.

B. Substitute t = 0, and solve for h.

C. Complete the square.

D. Determine the zeros of the relation.

Which quadratic relations have x = 3 as the axis of symmetry?

A. y = 4(x -3)^2 + 6

B. y = -2(x -5)(x -1)

C. y = x^2 - 6x + 7

D. All of the above