Let a ∈ R and let α, β be the roots of the equation x^2+60^(1/4) x+a=0 If α^4+β^4=-30, then the product of all possible values of a is ____

Let $\displaystyle a \in \mathbb{R}$ and let $\displaystyle \alpha, \beta$ be the roots of the equation $\displaystyle x^2+60^{\frac{1}{4}} x+a=0$ If $\displaystyle \alpha^4+\beta^4=-30$, then the product of all possible values of $\displaystyle a$ is $\displaystyle \_\_\_\_$