Take R as the independent variable, that is, this question is an equation about R, and use the formula △ = B2-4ac (AX 2+BX+C = 0).

It is known that b=c, a=2 and c=50 in this question are △ = C 2-4 * 2 * 50 = C 2-400.

When △≥ 0, the equation has two real roots.