Développer: A= (x-3) (1-x) - (4-3x)(2x+3) B= (3-x)(x+3) - (7x-6)(-3+2x) MERCIIIIII :).... Pergunta de ideia deLodosta

May 2019 1 65 Report

Développer:
A= (x-3) (1-x) - (4-3x)(2x+3)
B= (3-x)(x+3) - (7x-6)(-3+2x)

MERCIIIIII :)

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Verified answer

bonsoir =)

$A=(x-3) (1-x) - (4-3x)(2x+3) \\ =x - x^{2} -3+3x -(8x+12-6 x^{2} -9x) \\ =x- x^{2} -3+3x-8x-12+6 x^{2} +9x \\ =- x^{2} +6 x^{2} +x+3x-8x+9x-3-12 \\ =5 x^{2} +5x-15$

$B=(3-x)(x+3) - (7x-6)(-3+2x) \\ =3x +9 - x^{2} -3x - ( -21x+ 14 x^{2} + 18 -12x)
 \\ = 3x -3x - x^{2} +9 + 21x -14 x^{2} -18 +12x
 \\ = - x^{2} -14 x^{2} +21x+12x+9-18 \\ =-15 x^{2} + 33x -9$

voilà =)

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LaPerlEDeMath x +3x = 4x + 9 = 13 - 8 = 5x