Bonjour,
A= 9x² -12x +4
B= 4x² +28x +49
C= 16x² - 40x +25
D= x² +2x+1
Ce sont des identités remarquables
E=
2x*2x = 4x²
2x*3 = 6x
-3 *2x =6x
-3*3 = -9
=> 4x² +12x -9
F=
x² -14x +49 -( 28x² -4x +14x -2) =
x² -14x +49 - 28x² +4x -14+2 =
-27x² -10x +37
G=
3x³ +3x² -3x -(4x² -4x +1)=
3x³ +3x² -3x -4x² +4x -1=
3x³-x² +x -1
H=
(x+1)² = x² +2x+1
-2( x² +2x+1)= -2x² -4x -2
(x-1)(4-3x)= 4x -3x² -4 +3x
-2x² -4x -2 + 4x -3x² -4 +3x =
-5x² +3x -6
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Bonjour,
A= 9x² -12x +4
B= 4x² +28x +49
C= 16x² - 40x +25
D= x² +2x+1
Ce sont des identités remarquables
E=
2x*2x = 4x²
2x*3 = 6x
-3 *2x =6x
-3*3 = -9
=> 4x² +12x -9
F=
x² -14x +49 -( 28x² -4x +14x -2) =
x² -14x +49 - 28x² +4x -14+2 =
-27x² -10x +37
G=
3x³ +3x² -3x -(4x² -4x +1)=
3x³ +3x² -3x -4x² +4x -1=
3x³-x² +x -1
H=
(x+1)² = x² +2x+1
-2( x² +2x+1)= -2x² -4x -2
(x-1)(4-3x)= 4x -3x² -4 +3x
-2x² -4x -2 + 4x -3x² -4 +3x =
-5x² +3x -6