1. Problem: Given the function $f(x,y) = x^2 + y^2 - 2xy$ and $k = 1.30$, find the value of $k \cdot f(1,2)$. 2. First, calculate $f(1,2)$ by substituting $x=1$ and $y=2$ into the function: $$f(1,2) = 1^2 + 2^2 - 2 \times 1 \times 2$$ 3. Simplify the expression: $$f(1,2) = 1 + 4 - 4 = 1$$ 4. Now multiply this result by $k$: $$k \cdot f(1,2) = 1.30 \times 1 = 1.30$$ 5. Therefore, the value of $k \cdot f(1,2)$ is $1.30$.