Bonsoir,
Developper puis réduire :
Q = 3x(2x - 5) - (x + 6)(2x - 5)
Q = 6x^2 - 15x - (2x^2 - 5x + 12x - 30)
Q = 6x^2 - 2x^2 - 15x - 7x + 30
Q = 4x^2 - 22x + 30
2) calculer Q pour x = 2 :
Q = 4 * 2^2 - 22 * 2 + 30
Q = 4 * 4 - 44 + 30
Q = 16 - 14
Q = 2
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Bonsoir,
Developper puis réduire :
Q = 3x(2x - 5) - (x + 6)(2x - 5)
Q = 6x^2 - 15x - (2x^2 - 5x + 12x - 30)
Q = 6x^2 - 2x^2 - 15x - 7x + 30
Q = 4x^2 - 22x + 30
2) calculer Q pour x = 2 :
Q = 4 * 2^2 - 22 * 2 + 30
Q = 4 * 4 - 44 + 30
Q = 16 - 14
Q = 2