calculus
posted by Mary .
Find a value for k so that 2x^2 + kx + 1 has no real roots.

When an expression has no real roots, the discriminant is less than zero.
For example,
3x²+kx+2=0
has no real roots when
k²4*3*2<0
or
k<24
Proceed along the same lines for the given equation.