The equation y=x^4 +3x^3 -x^2 -3x has four solutions and is shown in graph. which of the following student statements is true?
statement #1: the equation has four non-real solutions because there are four x-intercepts.
statement #2: the equation has three real solutions because there are three turning points on the graph.
statement #3: the equation has four real solutions because there are four x-intercepts.