Question

Answer!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

Answer:

84xy

Step-by-step explanation:

According to identity a2 - b2 = (a + b) (a - b)

here a = 3x + 7y and b = 3x - 7y

a2 - b2 = (a + b) (a - b)

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

(6x) (3x + 7y - 3x +7y)

= (6x) (14y)

= 84xy

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Answer 2

Answer:

→ ( 3x + 7y )² – ( 3x – 7y )²

→ ( 3x + 7y – 3x + 7y )

→ ( 3x + 7y + 3x – 7y )

→ ( 14x ) ( 6y )

→ l 84xy