The Fundamental Theorem of Algebra states that a polynomial of degree \( n \) has exactly \( n \) roots in the complex number system (counting multiplicities).
The given polynomial is \( y = 8x^5 - 2x^4 + 6 \). The highest degree term is \( 8x^5 \), which indicates that the degree of the polynomial is 5. Therefore, according to the Fundamental Theorem of Algebra, this polynomial will have five roots (including complex roots and counting multiplicities).
So, the correct response is: five roots.