x=-b/2a=12/4=3
y=2*3²-12*3+14=18-36+14=-4
вершина (3 --4)
d=√(3-0)²+(-4-0)²=√9+16=√25=5
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x=-b/2a=12/4=3
y=2*3²-12*3+14=18-36+14=-4
вершина (3 --4)
d=√(3-0)²+(-4-0)²=√9+16=√25=5