Bonsoir,
E = (x-2)(2x+3) -3(x-2)
1)
E = 2x² + 3x - 4x - 6 - 3x + 6
E = 2x² - 4x
2) E = (x-2)(2x+3) -3(x-2)
E = (x-2)(-3+2x+3)
E = (x-2)(2x)
E = 2x(x-2)
E = 2F puisque l'on pose F = x(x-2)
3) D'après la question 2, (x-2)(2x+3) -3(x-2) = 2x(x-2)
Alors x = 0 ou x = 2
S={0;2}
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Bonsoir,
E = (x-2)(2x+3) -3(x-2)
1)
E = (x-2)(2x+3) -3(x-2)
E = 2x² + 3x - 4x - 6 - 3x + 6
E = 2x² - 4x
2) E = (x-2)(2x+3) -3(x-2)
E = (x-2)(-3+2x+3)
E = (x-2)(2x)
E = 2x(x-2)
E = 2F puisque l'on pose F = x(x-2)
3) D'après la question 2, (x-2)(2x+3) -3(x-2) = 2x(x-2)
Alors x = 0 ou x = 2
S={0;2}