In Exercises 96-99, use a graphing utility with a viewing rectangle large enough to show end behavior to graph each polynomial function. Then use the x-intercepts for the graph to solve the polynomial equation. Check by substitution. 96. Use the graph of y = x2 + 3x – 4 to solve x? + 3x – 4 = 0. 97. Use the graph of y = x + 3x2 – x x3 + 3x2 – x - 3 = 0. 3 to solve 98. Use the graph of y = 2x³ – 3x2 2x3 – 3x? – 11x + 6 = 0. 11x + 6 to solve -x4 + 4x3 - 4x2 to solve 99. Use the graph of y -x4 + 4x3 4x2 = 0.

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