Question

find the product (xy+3y+4x) * (y-7)​

Answer 1

Answer:

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(xy+3y+4x)(y−7)

=(xy+3y+4x)(y+−7)

=(xy)(y)+(xy)(−7)+(3y)(y)+(3y)(−7)+(4x)(y)+(4x)(−7)

=xy^2−7xy+3y^2−21y+4xy−28x

=xy^2−3xy+3y^2−28x−21y