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b. (x+5)x(5x-1)= 5xkuadrat-x+25x-5=5xkuadrat +24x-5
c. (7-2x)x(2x-7)=14x-49-4xkuadrat+14x=4xkuadrat+28x-49
B.) (x+5).(5x-1) = 5x² + 24x -5
C.) (7-2x).(2x-7) = 14x - 45x²-14x