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Comment calculer
(3×(-2)-5)(3×(-2)+5)-(4×(-2)-1)(3×(-2)+5


Répondre :

(3x(-2)-5)(3x(-2)+5)-(4x(-2)-1)(3x(-2)+5)
= (-6-5)(-6+5)+(8+1)(-6+5)
= -6 x (-6) + (-6) x 5 + (-5) x (-6) + (-5) x 5 + 8 x (-6) + 8 x 5 + 1 x (-6) + 1 x 5
= 36 -30 +30 -25 -48 +40 -6 +5
= 11 -9
= 2