Factoriser :
C = (x - 5)(x + 6) - (x - 5)(2x - 3)
D = x^2 - 81 + (x + 9)(5 - x)
Merci de l'aide :)
C = (x - 5)(x + 6) - (x - 5)(2x - 3)
D = x^2 - 81 + (x + 9)(5 - x)
Merci de l'aide :)
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Verified answer
C= (x-5) (x+6-2x-3)= (x-5) ( -x+3)
C = ( x -5) ( x +6 - 2 x +3)
C = ( x -5) ( - x + 9)
D = x² - 81 + ( x +9) ( 5 -x )
D = ( x -9)(x +9) + (x +9) (5 -x )
D = ( x +9) ( x -9 + 5 -x)
D = ( x +9) ( - 4)