Question

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Answer 1

1: \(\left(B+2x^2y^3\right)\cdot\left(-3xy\right)=-3x^2y^2-6x^3y^4\)

=>\(\left(B+2x^2y^3\right)\cdot3xy=3xy\left(xy+2x^2y^3\right)\)

=>\(B+2x^2y^3=xy+2x^2y^3\)

=>B=xy

2: \(2xy^2\left(B-x^3y\right)=2x^3y^2-2x^4y^3\)

=>\(2xy^2\left(B-x^3y\right)=2xy^2\left(x^2-x^3y\right)\)

=>\(B-x^3y=x^2-x^3y\)

=>\(B=x^2\)