Plot the graph of y = -2x²+4x+7, for values of x from x= -2 to x=4. Determine, from the graph, the coordinates and nature of the turning point of the curve. Use the graph to find the roots of
i) -2x²+4x+7=0
ii) 2x² = 4x+14
iii) 4x = 2x²-12
iv) -2x²+x = -6
i) -2x²+4x+7=0
ii) 2x² = 4x+14
iii) 4x = 2x²-12
iv) -2x²+x = -6