Solving Quadratics

Solve by factoring: x² - 9x + 20 = 0

• x = -4 and x = -5
• x = 20 and x = -9
• x = 4 and x = 5
• x = -4 and x = 5

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 by factoring

x²+12x+35=0

• x = -5 or x = -7

• x = 5 or x = 7

• x = -35 or x = -1

• x = -9 or x = -4

Solve by factoring:

n² - 2n = 0

• n = 2 and 0

• n = -2 and 0

• n = 2

• n = 0

What are the factors AND solutions of x² + 2x – 3 = 0

• (x - 2)(x + 1); x=2, x=-1
• (x + 1)(x - 3); x=-1, x=3
• (x + 2)(x - 1); x=-2, x=1
• (x - 1)(x + 3); x=1, x=-3

Find the solutions to this equation.

5x ( 7x - 3 ) = 0

• x = 0 and x = 3 / 7

• x = 0 and x = - 3 / 7

• x = 0 and x = 7 / 3

• x = -5 and x = 3 / 7

Solve by factoring: 2x² - 5x - 12 = 0

• x = -4 and x = -6
• x = 4 and x = -3/2
• x = 4 and x = 6
• x = -4 and x = 3/2

Solve

3x² + 5x = 12

• x = -4/3, x = 3

• x = 4/3, x = -3

• x = -1, x = 4

• x = 1, x = -4

Solve the equation by factoring.

Solve the equation by factoring.