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Question

Find the product (x+yz)(x2+y2+z2xy+yz+zx).

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Solution

(x+yz)(x2+y2+z2xy+yz+zx)
=x(x2+y2+z2xy+yz+zx)+y(x2+y2+z2xy+yz+zx)z(x2+y2+z2xy+yz+zx)
=x3+xy2+xz2x2y+xyz+zx2+yx2+y3+yz2xy2+y2z+zxyzx2zy2z3+xyzyz2z2x
=x3+y3z3+3xyz

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