Sagot :
Bonsoir,
S = 3x² + 27 - 18x - (3 - x)(2x + 1).
= 3x² +27 -18 -( 6x +3 -2x -1)
= 3x² +27 -18 - 6x -3 +2x +1
= 3x² -4x +7
Bonsoir,
Factoriser :
S = 3x²+27-18x-(3-x)(2x+1)
S = 3(x²+9-6x)-(3-x)(2x+1)
S = 3(x²+9-6x)+(-3+x)(2x+1)
S = 3(x²-6x+9)+(-3+x)(2x+1)
S = 3(x-3)²+(-3+x)(2x+1)
S = (-3+x)(3(x-3)+2x+1)
S = (-3+x)(3x-9+2x+1)
S = (-3+x)(5x-9+1)
S = (-3+x)(5x-8)
Bonne soirée.