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a=-2 b=5 c=7
delta=b^2 - 4ac= 25+56=81
b) y=2x² +3x+2
a=2 b=3 c=2
delta=b^2 - 4ac=9-16=-7
c) y=-2x² +3x-1
a=-2 b=3 c=-1
delta=b^2-4ac=9-8=1
d)y=4x² -12x+9
a=4 b=-12 c=9
delta=b^2 - 4ac=144-144=0
e) y=-1/2x² +6x-3
a=-1/2 b=6 c=-3
delta=b^2-4ac=36-6=30