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5x^2-x+25x-5= 5x^2+24x-5
14x-4x^2-49+14x= -4x^2+28x-49
20y - 100
b. (x + 5) x (5x - 1)
5x^2 - x + 25x - 5
5x^2 + 24x - 5
c. (7 - 2x) x (2x - 7)
14x - 49 - 4x^2 + 14x
4x^2 + 28x - 49
Ket : ^2 = kuadrat