Salut !!
Calculons Q(x) - T(x) et -2T(x) + 3Q(x)
T(x)= 3x² + 6x⁵ + 4x³ - 5
Q(x)= 3x + 7x² - 5x³
Q(x) - T(x) = 3x²+6x⁵+4x³-5 - (3x+7x²-5x³)
Q(x) - T(x) = 3x²+6x⁵+4x³-5 -3x-7x²+5x³
Q(x) - T(x) = (3x²-7x²)+(4x³+5x³)+6x⁵-3x-5
Q(x) - T(x) = -4x² + 9x³ + 6x⁵ - 3x -5
Q(x) - T(x) = 6x⁵ + 9x³ - 4x² - 3x -5
-2T(x) = -2(3x² + 6x⁵ + 4x³ -5)
3Q(x) = 3(3x + 7x² - 5x³)
-2T(x)= -6x² -12x⁵ - 8x³ + 10
3Q(x)= 9x + 21x² -15x³
-2T(x)+3Q(x)= -6x²-12x⁵-8x³+10+9x+21x²-15x³
-2T(x)+3Q(x)= (-15x³-8x³)+(21x²-6x²)-12x⁵+10x+9
-2T(x)+3Q(x)= -12x⁵-23x³+15x²+9x+10
