Solveit

a^2+b^2=c^2

64+4=c^2

sqrt(68 = 8.2462112512353211

http://www.regentsprep.org/regents/math/algtrig/ate3/discriminant.htm

ax^2 + bx + c  

D=b^2 - 4ac

x1=-b+D^1/2 /2a

x2=-b-D^1/2 /2a

x=3 :D

aa i understood )

Omi how didi you get 0.5

Thanks Omi67 ! :)

but there is no two answers, teacher said that parabola can be inverted and it means that it can be C (-3,0)  :D

Thanks melody for your answer ! :)

but there is no two answers, teacher said that parabola can be inverted and it means that it can be (-3,0)  :D

Thanks CPhill ! :)