Question

If x=-2 then 3x(6x^2-3x-2) -2x( 5x-x^2-6)=?

Answer 1

$= 3x( {6x}^{2} - 3x - 2) - 2x(5x - {x}^{2} - 6) \\ = 3( - 2) (6( - 2) - 3( - 2) - 2) - 2( - 2)(5( - 2) - {( - 2)}^{2} - 6) \\ = - 6( - 12 + 6 - 2) + 4( - 10 - 4 - 6) \\ =72 - 36 + 12 - 40 - 16 - 24 \\ = -32$

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