Answer
See table.
Work Step by Step
Step 1. Given $f(x)=4x^3-x^2+2x-7$, we can identify 3 sign changes indicating that there could be 3 or 1 positive zeros. Put the numbers in the table.
Step 2. $f(-x)=-4x^3-x^2-2x-7$, we can identify 0 sign change indicating that there is 0 negative zero. Put this number in the table.
Step 3. There should be 3 total zeros. thus the number of nonreal zeros will be the remaining after taking real zeros into account. Complete the table as shown.