For positive real numbers x and y, $$\begin{aligned}
x \cdot y & = 5 \\
x ^ { 2 } + y ^ { 2 } & = 15
\end{aligned}$$ Given this, what is the value of the expression $x ^ { 3 } + y ^ { 3 }$? A) 40 B) 45 C) 50 D) 60 E) 75
For positive real numbers x and y,
$$\begin{aligned}
x \cdot y & = 5 \\
x ^ { 2 } + y ^ { 2 } & = 15
\end{aligned}$$
Given this, what is the value of the expression $x ^ { 3 } + y ^ { 3 }$?
A) 40\\
B) 45\\
C) 50\\
D) 60\\
E) 75