Let $3x^2 + 4x + c = 0.$ What value of $c$ will give us exactly one solution for $x$?

Answer 1

3x^2 + 4x + c = 0 , ...... (skip all that $ stuff when typing it here)

You have one real root when the discriminant is equal to zero
b^2 - 4ac = 0
4^2 - 4(3)(c) = 0
12c = 16
c = 16/12 = 4/3