Solve Difference of Squares Quadratics

Solve:
x² - 49 = 0

• x = -7, x = 7

• x = -7

• x = 7

• x = -7, x = 1

4x² - 25

• (2x + 5) (2x - 5)

• (2x - 5)²

• (2x + 5)²

• 2x + 5(2x - 5)

Solve:  x² - 81 = 0 

• 9

• 9, -9

• 3, -3, 9, -9

• None of the above

Solve by Factoring:

x² - 49 = 0

• x = 7

• x = 7, x = -7

• x = 49

• x = 24.5, x = -24.5

(x + 3)(x - 3) ​ (a)   a difference of two squares (D.O.T.S.).

• is

• is not

Find the factors of 81 - 25w².

• (9 - 5w)(9 + 5w)

• (9w - 5)(9w + 5)

• (5w - 9)(5w + 9)

• (5 - 9w)(5 + 9w)

Factor and solve:

• (4x - 9)(4x + 9)

  x = {-9/4, 9/4}

• (2x - 3)(2x + 3)

  x = {-2/3, 3/2}

• (2x - 3)²

  x = {3/2}

• (2x + 3)²

  x = {-3/2}

Factor

25x² - 81

• (5x - 9)(5x + 9)

• (5x - 9)(5x - 9)

• (5x + 9)(5x + 9)

• Cannot be factored

• 10

• -10

• 1

• -1

• 0

Factor
81m² - 1 

• not factorable

• (m-9)(m+9)

• 9m(9m-1)

• (9m-1)(9m+1)