Question

find the product of (7x-3y) and (5x+4y). verify the result for x=3,y= -2​

Answer 1

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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

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