(10x4 - 4x3 - x2 - 6x + 8) + (-3x4 + 6x3 - 2x2 + 8x - 4)

34

Step-by-step explanation:

(10)(4)−(4)(3)−2x−6x+8+(−3)(4)+(6)(3)−(2)(2)+8x−4

= 40+−12+−2x+−6x+8+−12+18+−4+8x+−4

Combine like terms:

= 40+−12+−2x+−6x+8+−12+18+−4+8x+−4

= (−2x+−6x+8x)+(40+−12+8+−12+18+−4+−4)

= 34

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