MAT11L06 Solving quadratic equations

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

• Get factored form
• Write down: a=1, b=6, c=-13
• Make it equal 0 by subtracting 3 on each side
• Type it all in a calculator.

Solve by factoring: x² = 7x + 18

• -7 or -18

• 9 or 2

• 9 or -2

• 2 or 7

• 𝑥 = 4 or -7

• 𝑥 = -2 or 14

• 𝑥 = -4 or 3/2

• 𝑥 = -25 or 28

• 𝑥 = -4 or 1/9

• 𝑥 = 4 or 9

• 𝑥 = 3/2 or -3/2

• 𝑥 = 2/3 or -2/3

Which is the standard form for a quadratic equation?

• x = 7 only
  

• x = 0 only
  

• x = 0 and 7
  

• There is no real answer for this equation.
  

Solve by factoring: x² - 9x + 20 =0

• x = -2, 10

• x = -5, -4

• x = 4, 5

• Not factorable

• -3, 4
• 3, 4
• -4, -3
• -3

• c = -5

• c = -45

• r = 1

• r = -1

• r = 0

• r = 10