Question

simplify (7x+4y)^2-(7x-4y)^2​

Answer 1

Answer:

product of (7x−4y) and (3x−7y)

(7x−4y) (3x−7y)

⇒(7x)(3x)−(7x)(7y)−(4y)(3x)+(4y)(7y)

⇒21x  

2

−49xy−12xy+28y  

2

 

⇒21x  

2

+28y  

2

−61xy