1.4 - Discriminant, Quadratic Formula, Complete the Square

Solve using the quadratic formula:

2r² + 3r – 1 = 0

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Solve using completing the square:

x² + 4x – 40 = 0

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Solve the equation

4x² - 25 = 0

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Solve.

b²+14b=0

• b=0 and b=-14

• b=1 and b=14

• b=1 and b=-14

• b=0 and b=14

Tags

CCSS.HSA-REI.B.4B

Solve by factoring: x² + 3x - 18 = 0

• x = -3 and x = 6
• x = 3 and x = -6
• x = -9 and x = 2
• x = 9 and x = -2

Tags

CCSS.HSA-REI.B.4B

Solve x²-x-6 = 0

• x = -3, x = 2

• x = -1, x = 6

• x = -2, x = 3

• x = -6, x = 1

What is the discriminant of -2x² − x − 1 = 0. Then state how many real solutions it has.

• 76, 2 solutions

• -7, no solutions

• 9, 2 solutions

• 0, 1 solution

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

• 76, 2 solutions

• 29, 2 solutions

• -76, no solution

• 0, one solution

Find the discriminant and state how many real solutions it has.

y = x² + 4x + 4

• -24, no solutions

• 24, two solutions

• 0, one solution

• 4, two solutions