Methods to Solve Quadratic Equations Review

x² - 64 = 0

• x = 8

• x = 8 or x = - 8

• x = - 8

• x = 16 or x = - 16

Tags

CCSS.HSA-REI.B.4B

3x² - 12 = 0

• x = 4 or x = 0

• x = 2 or x = 0

• x = 4 or x = - 4

• x = 2 or x = - 2

Tags

CCSS.8.EE.A.2

x²+12x+35=0

• x = -5 or x = -7

• x = 5 or x = 7

• x = -35 or x = -1

• x = -9 or x = -4

Tags

CCSS.HSA-REI.B.4B

x²-6x+8=0

• x = -2 or x = -4

• x = 2 or x = 4

• x = 8 or x = -1

• x = 8 or x = 1

Tags

CCSS.HSA-REI.B.4B

But ... You must always set the equation

equal to zero before you factor.

Solve:

x²+9x =18

• x = 3 or x = 6

• x = -2 or x = -9

• x = 2 or x = 9

• x = -3 or x = -6

Tags

CCSS.HSA-REI.B.4B

x² + 8 = 6x

• x = -2 or x = -4

• x = 2 or x = 4

• x = 8 or x = -1

• x = 8 or x = 1

Tags

CCSS.HSA-REI.B.4B

... and never make the "x²" negative

Solve:
x² = 9x - 20

• x = -4 and x = -5

• x = 20 and x = -9

• x = 4 and x = 5

• x = -4 and x = 5

Tags

CCSS.HSA-REI.B.4B

If there is a bx-term in the quadratic equation, which method would not work:

• Factoring

• Square root method

• Quadratic formula

• Completing the square

Tags

CCSS.HSA-REI.B.4B

Which two methods requires the quadratic equation to be in standard form before you can begin solving?

• Factoring

• Square root method

• Quadratic formula

• Completing the square

Tags

CCSS.HSA-REI.B.4B

Solve
x² + 13x + 12 = 0

• x = -12, -1

• x = 12, 1

• x = 13, 1

• x = -13, -1

Tags

CCSS.HSA-REI.B.4B