x_left	x_right	f(x-left)	f(x_right)	x_new	f(x_new)
1.00000	2.00000	0.20956	-0.07694	1.50000	0.07257
1.50000	2.00000	0.07257	-0.07694	1.75000	-0.00401
1.50000	1.75000	0.07257	-0.00401	1.62500	0.03412
1.62500	1.75000	0.03412	-0.00401	1.68750	0.01497
1.68750	1.75000	0.01497	-0.00401	1.71875	0.00546
1.71875	1.75000	0.00546	-0.00401	1.73438	0.00072