Bonjour
A=(x-3) (1-y) = x -xy-3+3y
B=(3-x) (4+x)
= 12 +3x -4x-x^2
= -x^2 -x + 12
C=(2x+4) (x-1)
2x^2-2x+4x-4
2x^2+2x-4
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Bonjour
A=(x-3) (1-y) = x -xy-3+3y
B=(3-x) (4+x)
= 12 +3x -4x-x^2
= -x^2 -x + 12
C=(2x+4) (x-1)
2x^2-2x+4x-4
2x^2+2x-4