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Sagot :

g= (x+4)(x+1) = x²+x+4x+4= x² + 5x+4

h= (x+7)(4x+2) = 4x²+2x+28x+8 = 4x²+30x+8

i= (2x+1)(2x-1) = (2x)²-1² = 4x²-1

j= (2x-6)(y+3) ?? x et y mélangés ?

  = 2xy+6x-6y-18

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