B) find the coefficient of x^3 in the expansion (2x^3-5x^3+2x-1)(3x^3+2x^2-9x+7)
Coefficient of x^3: 2∗7+(−5)∗(−9)+2∗2+(−1)∗3=60.2*7+(-5)*(-9)+2*2+(-1)*3=60.2∗7+(−5)∗(−9)+2∗2+(−1)∗3=60.
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