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b. (x+5) x (5x-1) = 5x kuadrat - 5x + 25x -5
= 5x kuadrat + 20x - 5
c. (7-2x) x (2x-7)= 14x-49-4x kuadrat+14x
= -4x kuadrat + 28x -49
no 1 nya gak tau