Quadratics Quiz

3x²-48=0

• x= 4

• x= - 4

• x= - 4, 4

• x= - 16,16

If the discriminant is zero, you will have ...

• no real solutions

• 2 real solutions

• 1 real solution

• 3 real solutions

Select all statements that are true about the graph above

• The graph is concave up

• The graph is concave down

• In the standard form, a is negative

• There is one solution

• The discriminant is positive

What are the solutions?

• x= 0 and x= -4

• x= 0 and x= 4

• No Real Solution

• x= 2

To solve a quadratic by graphing is to find where the parabola crosses the x-axis. We call these the ___. Select all that apply.

• zeros

• x-intercepts

• solutions

• roots

• y-intercept

Solutions are the x-intercepts (also known as zeros), because

• the graph crosses the x-axis where y=0

• the graph crosses the x-axis where x=0

• the graph crosses the y-axis where x=0

• the graph crosses the y-axis where y=0

Is the graph of the following quadratic equation concave up or concave down?

• Concave up, because the a value is positive

• Concave up, because the b value is positive

• Concave down, because the a value is negative

• Concave down, because the b value is negative

Factor completely: x²+16x+64

• (x+4)(x+16)

• (x-8)(x-8)

• (x+2)(x+32)

• (x+8)(x+8)

x²+4x-32=0

• x= -8, 4

• x= 8, -4

• x= -8, -4

What are the factors of x²-8x-48

• (x-12)(x+4)

• (x+12)(x-4)

• (x+12)(x+4)

• (x-12)(x-4)