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  (4x³-4+7x)-(2x³-x-8)
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(4x³-4+7x)-(2x³-x-8)

User Sumit Sonawane
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(4x³-4+7x)-(2x³-x-8) = 4x³-4+7x - 2x³ + x+8 = (4x³-2x³) + (7x+x) -4+8 =

= 2x³ + 8x +4

(4x³-4+7x)-(2x³-x-8) = 2x³ + 8x +4
User Stupidfrog
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