bonjour
P = -2*4x - 2*(-5) + 3x*4x + 3x*(-5)
= -8x + 10 + 12x² - 15x
P = 12x² - 23x + 10
et
Q = 2x*(-x) + 2x*5 - (x*x + x*(-6) + 7*x+7*(-6))
= -2x² + 10x - (x² - 6x + 7x - 42)
= -2x² + 10x - x² - x + 42
= -3x² + 9x + 42
puisque (a+b) (c+d) = ac + ad + bc + bd
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bonjour
P = -2*4x - 2*(-5) + 3x*4x + 3x*(-5)
= -8x + 10 + 12x² - 15x
P = 12x² - 23x + 10
et
Q = 2x*(-x) + 2x*5 - (x*x + x*(-6) + 7*x+7*(-6))
= -2x² + 10x - (x² - 6x + 7x - 42)
= -2x² + 10x - x² - x + 42
= -3x² + 9x + 42
puisque (a+b) (c+d) = ac + ad + bc + bd