Factor 9x^2-49y^2 Enter your answer in the box

(3x+7y) (3x-7y)

(3x - 7y) (3x + 7y)

Step-by-step explanation:

9x² - 49y² ← is a difference of squares and factors in general as

a² - b² = (a - b) (a + b)

here 9x² = (3x) ² ⇒ a = 3x and 49y² = (7y) ⇒ b = 7y

9x² - 49y²

= (3x) ² - (7y) ² = (3x - 7y) (3x + 7y)