Factoring PST and DOS

What is the factored form of x² + 18x + 81?

• (x – 8)²

• (x – 9)²

• ( x + 9)²

• (x + 9) (x - 9)

Identify how you would solve the problem below:

16x² - 144=0

• DOTS (Difference of Two Squares)

• GCF(Greatest Common Factor)

• PST (Perfect Square Trinomial)

• GCF and DOTS

Identify how you would solve the problem below:

13x²+39x=0

• DOTS (Difference of Two Squares)

• GCF(Greatest Common Factor)

• PST (Perfect Square Trinomial)

• GCF and DOTS

Identify how you would solve the problem below:

25x²-90x+81=0

• DOTS (Difference of Two Squares)

• GCF(Greatest Common Factor)

• PST (Perfect Square Trinomial)

• GCF and DOTS

Identify how you would solve the problem below:

20x²-45=0

• DOTS (Difference of Two Squares)

• GCF(Greatest Common Factor)

• PST (Perfect Square Trinomial)

• GCF and DOTS

Determine the factors:

25x² + 60x + 36

• (5x + 6)²

• (5x - 6)²

• (6x+5)²

• (6x-5)²

x² - 49=0

• (x-7i)(x+7i)

• (x-7)(x+7)

• (x+7)²

• (x-7)²

x² - 25

• ( x + 5 ) ( x - 5 ) 

• ( x - 5 ) ( x - 5 ) 

• ( x + 5 ) ( x + 5 ) 

• Prime

Which of these can factor using difference of two squares?

Factor x² - 289

• (x + 17) (x + 17)

• (x - 17) (x - 17)

• (x + 17) ( x - 17)

• no factors