Question

The co-efficient of y in the expansion of (3x-y) (3x+y) is​

Answer 1

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

= (3x)²-(y)²

= 9x²-y²

this can be written as

9x²-y²+0y

so the coefficient of y is 0

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Answer 2

Answer:

In the monomial 3x y ,\ the coefficient of y is 3x , the coefficient of x is 3y and the coefficient of x y is 3.