Factoring Differences of Perfect Squares

Which of the following is a difference of perfect squares?

• x² - 18

• 4x² + 36 

• 9x² - 100

• x² + 4

p²-36

• (p+6)(p+6)

• (p+6)(p-6)

• (p-6)(p-6)

• (6p-6)(p+6)

(a)  

• A

• B

• C

• D

(a)  

• A

• B

• 
  C

• D

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)

x² - 9

• (x + 3) (x - 3)

• (x - 3) (x - 3)

• (x + 3) (x - 6)

• Can't factor using Diff. of Squares

Which of the following are in the form of difference of squares? Select all that apply.

• (x - 3)(x + 3)

• (2d - 5)(2d - 5)

• (f + 6)(f - 6)

• (k² - 10)(k² + 10)

• (y + 1)(y + 1)

Factor x² – 16.

• (x + 2)(x – 8)

• (x – 4)(x – 4)

• (x + 4)(x + 4)

• (x + 4)(x – 4)

4a² - 25

• (2a + 5) (2a - 5)

• (2a - 5) (2a - 5)

• (x + 5) (x - 5)

• Can't factor using Diff. of Squares