What can be the shape of graph of y=2x2+bx+cb,cϵ R
Can't say
As a > 0, the graph of given quadratic expression must be upward (cup) shaped.
Note that if a < 0 in ax2 + bx + c, graph will look be a downward parabola(cap) shaped.
What can be shape of the graph if (m−2)x2+8x+(m+4) > 0 ∀ x ϵ R