The functions f(x)=3x^2-3x+7f(x)=3x 2 −3x+7f, left parenthesis, x, right parenthesis, equals, 3, x, start superscript, 2, end superscript, minus, 3, x, plus, 7 and g(x)=3x^2-3x-1g(x)=3x 2 −3x−1g, left parenthesis, x, right parenthesis, equals, 3, x, start superscript, 2, end superscript, minus, 3, x, minus, 1 are graphed in the xyxyx, y‑plane. If the graph of function fff crosses the yyy-axis at (0,b)(0,b)left parenthesis, 0, comma, b, right parenthesis and the graph of function ggg crosses the yyy-axis at (0,c)(0,c)left parenthesis, 0, comma, c, right parenthesis, then what is the value of b-cb−cb, minus, c?
