Factoring Differences of Squares

Factor 4m² - 49

• (2m + 7) (2m - 7)

• (2m - 7) (2m - 7)

• (m² + 7) (m² - 7)

• Can't factor using Diff. of Squares

Factor r² - 9t²

• (r + 3t) (r - 3t)

• (r - 3t) (r - 3t)

• (3r + t) (3r - t)

• (r + 3t) (r + 3t)

• (2-3a)(2-3a)

• (2-3a)(2+3a)

• (4-9a)(1)

• (2+3a)(2-3a)

Factor 121x² - 49

• (11x - 7) ²

• (11x - 7) (11x - 7)

• (11x + 7) (11x - 7)

• (12x + 7) (12x - 7)

(a)  

• A

• B

• C

• D

(a)  

• A

• B

• 
  C

• D

B. P5 - Because ​ (a)   is not a difference of squares, but ​ (b)   = ​ (c)   You can use the pattern for factoring a difference of squares to factor​ (d)   .

Which of the following is a difference of perfect squares?

• x² - 18

• 4x² + 36 

• 9x² - 100

• x² + 4

Factor: 
x² - 400

• ( x - 200) ( x + 200) 

• ( x + 20) ( x + 20) 

• Prime

• ( x - 20) ( x + 20)