Monoxdifly
MHB
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$$x^3-3xy^2=a$$
$$3x^2y-y^3=b$$
make a formula using a and b for x and y.
What I've done:
$$x^3-3xy^2+3x^2y-y^3=a+b$$
$$x^3+3x^2y-3xy^2-y^3=a+b$$
$$(x-y)(x^2+4xy+y^2)=a+b$$
I don't know what to do from here. Any hints?
$$3x^2y-y^3=b$$
make a formula using a and b for x and y.
What I've done:
$$x^3-3xy^2+3x^2y-y^3=a+b$$
$$x^3+3x^2y-3xy^2-y^3=a+b$$
$$(x-y)(x^2+4xy+y^2)=a+b$$
I don't know what to do from here. Any hints?