bonjour
F = 6 x - 15 + 12 x² + 20 x = 12 x² + 26 x - 15
G = - 10 x² + 8 x - 12 x² + 9 x = - 22 x² + 17 x
H = 35 x - 20 - 6 x² - 9 x = - 6 x² + 26 x - 20
I = 8 x² - 6 x + 12 x² - 12 x = 20 x² - 18 x
J = - 18 x² + 3 x + 28 x² - 8 x = 10 x² - 5 x
K = 4 x + 12 = 4 ( x + 3 )
L = 5 ( x + 5 )
M = x ( 7 + 9 x )
N = ( x + 3 ) ( - 7 x + 2 x ) = - 5 x ( x + 3 )
O 7 ( 2 x + 7 )
P = 27 x ( - x + 1 )
Q = 54 ( x + 2 )
Bonjour,
Développer puis réduire
F=-3(2x-5)+4x(3x+5)
= 6x +15 +12x² +20x
= 12x² +26x +15
G=2x(-5x+4)-3x(4x+3)
= -10x² +8x -12x² -9x
= -22x² -x
H=5(7x-4)+2x(-3x+9)
35 x -20 -6x² +18x
= -6x² +53x -20
I=-x(-8x+6)+4x(3x-3)
= -8x² +6x +12x² -12x
= 6x² -6x
J= -3x(6x-1)+4x(7x-2)
= -18x² +3x +28x² -8x
= 10x² -5x
ex 3
Factoriser
K=4x+4x3
= 4( x +3)
L=5x+25
= 5(x+5)
M= -7x²+9x
= x( -7x +9)
N = -7x(x+3)+2x(x+3)
= (x+3) ( -7x +2x)
= (x+3)( -5x)
O=14x+49
7( 2x +7)
P=-27x²+27x
= 27x( -x +1)
Q=54x+108
=54 (x + 2)