3(2x-3)² --> on reconnait que (2x-3)² est de forme (a-b)²=a²-2ab+b²
3(a²-2ab+b²)
3(2x²-2*2x*3+(-3)²)
3(4x²-12x+9)
12x²-36x+27
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Bonsoir3 ( 4 x² - 12 x +9)
= 12 x² - 36 x + 27
3(2x-3)² --> on reconnait que (2x-3)² est de forme (a-b)²=a²-2ab+b²
3(a²-2ab+b²)
3(2x²-2*2x*3+(-3)²)
3(4x²-12x+9)
12x²-36x+27