Ok, I know how to start this problem, but the synthetic division is confusing me a little.
Use synthetic division to verify the upper and/or lower bounds of the zeros of f.
f(x) = 2x^4 - 8x + 3
Upper bound: x = 3; Lower bound: x = -4
So the possible real zeros I think are:
plus or minus 1/2, plus or minus 1.5
Now, I am confused. Can anyone help?
You use 3 and -4. Because this is what you are given. So,
3 | 2 +0 +0 -8 +3
____+6+18+54+138__
__ _2 6 18 46 141
Now, from the upper and lower bound rule, you can confirm that 3 is an upper bound because all of the numbers in thel ast row (6,18,46,141) are all positive.
Does this help you?