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Jawab7.
(2x - 1)/(3) + 1 > (5x +3)/7 - 2 .....kali 21
7(2x -1) + 21 > 3(5x +3) - 42
14x - 7 + 21 > 15x + 9 - 42
14x + 14 > 15x - 33
14x - 15x > -33 - 14
-x > - 47
x < 47
8.
8x^2 - 2x+ 16 = 0, akar akarnya x1 dan x2
a = 8 , b = - 2 , c= 16
x1 , x2 = c/a = 16/8 = 2