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2x^2 - 3x + p = 2x -2
2x^2 -3x + p - 2x + 2 = 0
2x^2 - 5x + p + 2 = 0
gunakan rumus diskriminan
D = b^2 - 4ac
0 = (-5)^2 - 4(2)(p+2)
0 = 25 - 8(p+2)
0 = 25 - 8p -16
0 = 9 - 8p
8p = 9
p = 9/8