Asked by Anonymous

Identify a possible pair of integer values for a and c so that ax2+4x+c=0 has two imaginary solutions. Then write the equation.
Answered by oobleck
you need the discriminant to be negative. So,
16-4ac < 0
Make it easy, with a=1. That means 4c > 16
So try c=5

x^2+4x+5 = 0