MBF3C - Unit 3 Review

• Factor out GCF (common factor)

• Find the factors of the last number

  and which pair add up/subtract to equal the middle number.

• Factor out the GCF then find the factors of the last number

  and which pair add up/subtract to equal the middle number.

Factor:
18a²-15a

• 15a(3a-1)
• 3a(6a-1)
• 3(6a-5)
• 3a(6a-5)

• A.

  Divide both sides f the equation by 3.

• B.

  Take the square root of both sides of the equation.

• C.

  Subtract 12 from both sides of the equation.

• D.

  Find two values with a sum of 5 and a product of 12.

• A.

  Yes, she factored correctly and then used the zero product property

• B.

  No, she didn't factor correctly so the rest of her work is wrong.

• C.

  No, she did not set the equation equal to zero before factoring.

• D.

  Yes, she answered it correctly.

Factor: x² – 5x – 24

• A.

  (x - 5)(x + 19)

• B.

  (x - 8)(x + 3)

• C.

  (x - 3)(x + 8)

• D.

  (x - 19)(x + 5)

Find all the solutions for x when

x² + 9x - 36 = 0

• A.

  (x + 12)(x - 3)

• B.

  x = 12 and x = -3

• C.

  x = -12 and x = 3

• D.

  (x - 9)(x - 4)

ax²+bx+c=0  is the standard form of a quadratic equation.

• True
• False

Find all the solutions for x when

x² + 9x - 36 = 0

• A.

  (x + 12)(x - 3)

• B.

  x = 12 and x = -3

• C.

  x = -12 and x = 3

• D.

  (x - 9)(x - 4)

What is the middle term of the product when you mutiply the terms (a+3)(a+4)?

• 3a

• 7a

• 4a

• 12

Simplify by combining like terms:
4x² - 3x + 11 -2x

• 4x² - 5x + 11
• 11x + 11
• 16x² - 5x + 11
• 10x²