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20y=100
y=5
b.5x²-x²+25x-5
5x²+24x-5
c. 14x+49-4x²+14x
28x+49-4x²
B. (x + 5) (5x -1) = 5x^2 - x + 25x -5 = 5x^2 + 24x -5
C. (7 - 2x) (2x - 7) = 14x - 49 - 4x^2 + 14x = -4x^2 + 28x - 49
^= pangkat