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Sagot :

7MK
A= (x-3)² + (x-3)(1-2x)
A= x²- 6x+3²+x-2x²-3+6x
A= x²-6x+9+x-2x²-3+6x
A= -x²+6
1) développement
A=(x-3)² + (x-3)(1-2x)
A = x² - 6x + 9 + x -2x² - 3 + 6x
A = - x² +x + 6
2) réduction
A= x ( 1- x) + 6

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