Question
If $\Delta$ is an operation on integers such that for integers a and b, $\text{a }\Delta\text{ b}=\text{a}-\text{b}-(-5)$. Find the values of: $4\ \Delta\ (-5)$
✓
Answer
$\because\text{a }\Delta\text{ b}= \text{a}-\text{b}-(-5)$ $\therefore4\ \Delta\ (-5)=4-(-5)-(-5)$ $= 4 +5 + 5$ $= 14$
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