a} (x-y) (3x-2y) b} A=(x+y) (x ²+y ²)

Question

a} (x-y) (3x-2y)                                                                           b} A=(x+y) (x ²+y ²)

dananhnhu · Answer

a, $(x-y)(3x-2y)$ $=3x^2-3xy-2xy+2y^2$   $=3x^2-5xy+2y^2$   b, $A=(x+y)(x^2+y^2)$   $=x^3+x^2y+y^2x+y^3$

dantam · Answer

a, $(x-y)(3x-2y)$   $=3x^2-2xy-3xy+2x^2$   $=5x(x-y)$   b, $A=(x+y)(x^2+y^2)$ $=x^3+x^2y+y^2x+y^3$

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