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JustDancer2016
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Efectuați: c) (3x - 7)[3(x + 1) - 2(x + 3)] - 2x(x + 6); d) (2x +5)[5(x + 1) + 2(x - 2)] - 4x(5x - 4).

Răspuns :

c) (3x-7)(3x+3-2x+6) -2x²-12= (3x-7)(x+9)-2x²-12⇒ 3x²+27x-7x-63-2x²-12⇒x²+20x-75

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