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Sagot :

AYUDA

H = x*4 + x*(-2x) - 3*4 - 3*(-2x)

  = 4x    -   2x²    -   12   + 6x  

  = -2x² + 10x - 12

puisque (a+b) (c+d) = ac + ad + bc + bd

Salut !

(x-3)(4-2x) = 4x-2x²-12+6x = -2x²+10x-12

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