Bonjour,
A= 4x² +20x+ 25x-10x² -25x
= -6x² +20x
B= -3x²+4x +12x -16 -(9x² -24x +16)
= -3x²+4x +12x -16 -9x² +24x -16
= -1éx² +40x -32
C= 25x² -10x -1 -( 16x² +8x +1)
= 25x² -10x -1 - 16x² -8x -1
= 9x² -18x -2
D= 25x² -( 49x² -28x +4)
= 25x² - 49x² +28x -4
= -24x² +28x -4
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Bonjour,
A= 4x² +20x+ 25x-10x² -25x
= -6x² +20x
B= -3x²+4x +12x -16 -(9x² -24x +16)
= -3x²+4x +12x -16 -9x² +24x -16
= -1éx² +40x -32
C= 25x² -10x -1 -( 16x² +8x +1)
= 25x² -10x -1 - 16x² -8x -1
= 9x² -18x -2
D= 25x² -( 49x² -28x +4)
= 25x² - 49x² +28x -4
= -24x² +28x -4