When I graphed

y=-0.0064x^5+58.977x^4-215798x^3+(( 4*10^8)x^2)-((4*10^11)+(1*10^14)

It gave me a straight line. I got this equation from Microsoft Excel, but on excel this equation followed the trend of my data.

1800 60,515
1810 96,373
1820 123,706
1830 202,589
1840 312,710
1850 515,547
1860 813,669
1870 942,292

I don't know what I did wrong, but the raw equation that was given to me on Microsoft Excel was:

y = -0.0064x5 + 58.977x4 - 215708x3 + 4E+08x2 - 4E+11x + 1E+14

What should I do to fix this problem? Should I use a different application? I attached a photo of what the graph looks like.