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a= 1 b=5 c=-234
X1,2 =-b±√b²-4ac
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2a
= -5±√5²-4(1)(-234)
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2(1)
= -5±√25+936
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2
= -5±√961
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2
= -5±31
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2
X1 = -5+31. X2= -5-31
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2 2
= 26 = -36
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2. 2
= 13 = -18
yang dipake selalu yg (+)