9-5 Factoring Differences of Squares A

Factor 121x² - 49

• (11x - 7) ²

• (11x - 7) (11x - 7)

• (11x + 7) (11x - 7)

• (12x + 7) (12x - 7)

• prime

• y = {-2, 3}

• y = {-4, 4}

• y = {-3, 5}

x² + 81

• Prime

• ( x - 9 ) ( x + 9 )

• ( x + 9 ) ( x + 9 )

• ( x - 9 ) ( x - 9 )

Factor r² - 9t²

• (r + 3t) (r - 3t)

• (r - 3t) (r - 3t)

• (3r + t) (3r - t)

• (r + 3t) (r + 3t)

We can't factor using difference of two square this

49x² + 4y². Why?

• Because 4 is not a perfect cubed number.

• Because 4 is not a perfect squared number.

• Because 49 is not a perfect squared number.

• Because we can't factor using difference of two squares if it is addition sign.

• x = 1/5 or x = -1/5
• x = 1/4 or x = -1/4
• x = 1/6 or x = -1/6
• x = 1/3 or x = -1/3

Factor 4m² - 49

• (2m + 7) (2m - 7)

• (2m - 7) (2m - 7)

• (m² + 7) (m² - 7)

• Can't factor using Diff. of Squares

• (2-3a)(2-3a)
• (2-3a)(2+3a)
• (4-9a)(1)
• (2+3a)(2-3a)