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2x²+5x-3=0
(2x-1)(x+3)=0
x1=1/2
x2=-3
jika x=0
y=-3
titik puncak
a=2 b=5 c=-3
xppuncak= -b/2a
xp=-5/2.2
xp=-5/4 atau -1 1/4
yp=b²-4ac/-4a
25-4.2.-3/-4.2
yp=25+24/-8
yp=49/-8 atau -6 1/8