Unit 4~ Solving Quadratics Practice Quiz

What are the roots?
(x + 5)(2x - 3) = 0

• x = 5 ; x =  -³/₂
• x = -5 ; x = ³/₂
• x = -5 ; x = 3
• 2x² + 7x - 15

Solve by factoring & using the zero product property.

2x² + 2x - 12 = 0

• x = 3 ; x = -3

• x = 12 ; x = -12

• x = -3 ; x = 2

• x = -2 ; x = 2

Solve by factoring & using the zero product property.

f(x) = x² + x - 20

• x = 5 ; x = -4

• x = -20 ; x = 0

• x = -5 ; x = 4

• x = 20; x = 0

Which quadratic is being solved in the formula?

• y=2x² - 5x + 3

• y=2x² + 5x + 3

• y=3x² - 5x + 2

• y=2x² - 5x - 3

Determine the values of a, b, and c for the quadratic equation:

4x² – 8x = 3

• a = 4, b = -8, c = 3

• a = 4, b =-8, c =-3

• a = 4, b = 8, c = 3

• a = 4, b = 8, c = -3

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

What should you do first in solving this equation?

x² + 6x - 13 = 3

• Factor

• Write down: a = 1, b = 6, c = -13

• Subtract 3 from both sides.

• Add 3 to both sides.

Tags

CCSS.HSA-REI.B.4B

Use the quadratic formula to find the solutions for

y = 3x² + 8x - 1

• 0.12 and -2.786

• 0.279 and 2.387

• .35 and -8.35

• 0.2358 and -1.236

____________
For the function above, is the discriminant positive, negative, or zero?

• Positive
• Negative
• Zero
• Not Sure

Tags

CCSS.HSA.REI.B.4

Determine the value of the discriminant and state how many and what type of solution(s) the function has.

x² + 7x + 13

Remember: b² - 4ac

• 400, 2 real root

• 0, 1 real root with a multiplicity of 2

• -400, 2 imaginary roots

• -3, 2 imaginary roots

What is the discriminant of 6x² − 2x − 3 = 0

• 76

• 29

• 68

• none of these

Tags

CCSS.HSA-REI.B.4B