Day 2 Solving Quadratic Equations by Factoring

The solutions (x-intercepts) of the quadratic equation 
x²-12x+35=0 are

• x = -5 or x = -7
• x = 5 or x = 7
• x = -35 or x = -1
• x = -9 or x = -4

Solve by factoring:

x² + 9x + 20 = 0

• x = -2, 10

• x = -5, -4

• x = 4, 5

• Not factorable

Find the solutions (or x-intercepts) of

x² - x - 30 =0

• x = 10 or -3

• x = -6 or -5

• x = 6 or -5

• x = -6 or 5

Solve by factoring (x-intercepts):

x² + 12x + 36 = 0

• x= -6

• x= -6, 6

• x=6

• Not factorable

Solve
x² - 2x - 24 = 0

• x = -6, x = 4
• x = 6, x = -4
• x = 12, x = -2
• x = 8, x = -3

What should you do first in solving this equation?
x² + 6x - 13 = 3

• Get factored form
• Find two numbers which add to make 6 and multiply to make -13
• Make it equal 0 by subtracting 3 on each side
• Type it all in a calculator.

Solve this quadratic equation?

x² + 6x - 13 = 3

• x= -8 or -2

• x = 8 or -2

• x = -8 or 2

• x = 4 or 2

• x = -4 or -6

Solve

x² + 2x - 20 = 4

• x = -6, x = 4

• x = 6, x = -4

• x = 12, x = -2

• x = 8, x = -3

Solve

x² - 3x - 10 = 30

• x = -5 or x = 8

• x = -8, x = 5

• x = 5, x = -2

• x = 2, x = -5

Solve

x² - 3x - 12 = 28

• x = -5 or x = 8

• x = -8, x = 5

• x = 5, x = -2

• x = 2, x = -5