Question

using a graphing calculator, find the real zeros of the function. f(x) = x^6-8x^5+15x^3-2x^2+9

Answer 1

looks like there is one just below 8 say at 7.8

Answer 2

another at about 1.6

Answer 3

and if you zoom in you will see that those are the only two. it looks at first glance like there are more but there are not. looks like one around -1 but it is an illusion, the graph stays above the x-axis there. very tricky

Answer 4

ok. i got it. took me a minute. thanks

Answer 5

took me a minute too. welcome