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Sagot :

1) A= (x-3)(4-x)+(x-3)(1-2x)
A= (4x-x^2-12+3x) + (x-2x^2-3+6x)
A= - x^2 + 7x - 12 - 2x^2 + 7x -3
A= -3 x^2 + 14x - 15

2) A= -3 *(-2)^2 + 14* (-2) -15
A= -3*-4 - 28 - 15
A= -12 - 28 - 15
A= -55

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