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b'' - 4ac = 0
(-p)" - 4.4.25 = 0
(-p)'' - 400 = 0
p'' - 400 = 0
p'' = 400
p = 20
b²-4ac = 0
p²-4(4)(25) = 0
p²-400 = 0
p² = 400
p = √400
p = 20 atau -20
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