(5 x - 1)(x**2 + 4 x - 3) =
(5 x - 1)(x**2 + 4 x - 3) mean ( 5 x - 1 )( x ^ 2 + 4 x - 3 ) then ( 5 x - 1 )( x ^ 2 + 4 x - 3 )= 5 x * x ^ 2 + 5 x * 4 x + 5 x * ( - 3 ) - 1 * x ^ 2 - 1 * 4 x - 1 * ( - 3 ) = 5 x ^ 3 + 20 x ^ 2 - 15 x - x ^ 2 - 4 x + 3 = 5 x ^ 3 + 19 x ^ 2 - 19 x + 3
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