bjr
tu sais que k (a+b) = k*a + k*b donc : * = multiplié par
8m (m - 4) = 8m * m + 8m * (-4) = 8m² - 32m
9(x² - 5x) + 21x (2x - 5) = 9*x² + 9*(-5x) + 21x*2x + 21x * (-5)
= 9x² - 45x + 42x² - 105x
= 51x² - 150x
3t² + 9t - 3(4t² - 6t + 12)
= 3t² + 9t - 3*4t² - 3*(-6t) -3*12
= 3t² - 9t - 12t² + 18t - 36
= -9t + 9t - 36
Réponse
Bonjour,
8m*(m-4) = 8m*m+8m*(-4)
= 8m²-32m
9*(x²-5x)+21x*(2x-5) = 9*x²+9*(-5x)+21x*2x+21x*(-5)
= 9x²-45x+42x²-105x
= 51x²-150x
3t²+9t-3*(4t²-6t+12) = 3t²+9t-3*4t²-3*(-6t)-3*12
= 3t²+9t-12t²+18t-36
= -9t²+27t-36
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bjr
tu sais que k (a+b) = k*a + k*b donc : * = multiplié par
8m (m - 4) = 8m * m + 8m * (-4) = 8m² - 32m
9(x² - 5x) + 21x (2x - 5) = 9*x² + 9*(-5x) + 21x*2x + 21x * (-5)
= 9x² - 45x + 42x² - 105x
= 51x² - 150x
3t² + 9t - 3(4t² - 6t + 12)
= 3t² + 9t - 3*4t² - 3*(-6t) -3*12
= 3t² - 9t - 12t² + 18t - 36
= -9t + 9t - 36
Réponse
Bonjour,
8m*(m-4) = 8m*m+8m*(-4)
= 8m²-32m
9*(x²-5x)+21x*(2x-5) = 9*x²+9*(-5x)+21x*2x+21x*(-5)
= 9x²-45x+42x²-105x
= 51x²-150x
3t²+9t-3*(4t²-6t+12) = 3t²+9t-3*4t²-3*(-6t)-3*12
= 3t²+9t-12t²+18t-36
= -9t²+27t-36