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20y -100
b. (x +5) (5x -1)
5x² -x +25x -5
5x² +24x -5
c. (7 -2x) (2x -7)
14x -49 -4x² +14x
14x +14x -4x² -49
28x -4x≥ -49
B. 5x" -1x + 25x - 5 = 5x" +24x - 5
C. 14x -49 -4x" +14 = 14x -4x" -35
ket : ( " ) = pangkat dua.