Find the value of values of c that satisfy the equation f(b) - f(a)/b - a = f'(c) in the conclusion of the Mean Value Theorem for the following function and interval.
f(x) = 3x² + 5x - 2. [-1,3]
The value(s) of c that satisfy the equation f(b) - f(a)/b - a = f'(c) is/are__