Answer:
x^7-x^6+2x^5-3x^4+4x^3+6x-3
Explanation:
the product (*)
(x3+2x-1)(x4-x3+3)
x3x4+x3(-x3)+x3(3)+2xx4+2x(-x3+2x(3)-1(x4)-1(-x3)-1(3)
x7-x6+2x5-3x4+4x3+6x-3
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