Solving Quadratics Day 1

What is the next step in solving after getting the quadratic in factored form?

(x + 2)(x - 3) = 0

• Plug in zero for x

• Multiply the binomials

• FOIL

• Set each binomial factor equal to zero

Solve by factoring: x² = 9x - 20

• x = -4 and x = -5

• x = 20 and x = -9

• x = 4 and x = 5

• x = -4 and x = 5

• 3

• 8

• -9

• -3

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

x² + 15x + 44 = 0

• {-8, 2}
• {-7, 5}
• {-11, -4}
• {-11}

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

Convert x² - 9x + 20 = 0 to factored form and solve.

• (x-10)(x+2)=0; x = -2, 10

• (x+4)(x+5)=0; x = -5, -4

• (x-4)(x-5)=0; x = 4, 5

• Not factorable

• 3

• 8

• -9

• -3