easy way to find out whether a turnin point is max or min eg: y=2x^2+4x+3 , the turning point is (-1,1)

Question

bahrom7893 · Answer

take the derivative.

saifoo.khan · Answer

See the value of "a"
ax^2 + bx + c = 0

anonymous · Answer

i must be pissin ou off with too many questions

saifoo.khan · Answer

If it's positive, then it will be a happy face, a minimum point.

anonymous · Answer

thanks guys

saifoo.khan · Answer

If it's negative, then there will be a sad face, a min point.

bahrom7893 · Answer

That's the easiest way, which u will unfortunately learn in calculus. The derivatice is:
4x+4, set it equal to 0 and solve for x.
4x+4=0
x=-1
then plug this back into the original to get the y value.

anonymous · Answer

wait if its a poitive parabola doesnt meanit max??

bahrom7893 · Answer

no a positive parabola is min.

anonymous · Answer

okay