Factoring Using an Area Model

What is the area as a sum of (x+9)(x-4)?

• x^2-9x+4x+36

• x^2+9x-4xx-36

• x^2-4x+9x+36

What goes on both sides of the diamond problem?

• 15x and 3x

• 45x and x

• 5x and 9x

• -15x and -3x

What do 5x^2 and 15x have in common? Or what is the GCF? 

• x

• 5

• 5x

What do 3x and 5x^2 have in common? What is the GCF?

• 5x

• x

• 3

What do 3x and 9 have in common? What is the GCF?

• x

• 3x

• 3

• 9

What is the factored form of 

5x^2+18x+9?

• (5x-3)(x+3)

• (x+3)(x+3)

• (x+3)(5x+3)