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: $(-9)\ \Delta\ (-4)$
✓
Answer
$\because\text{a }\Delta\text{ b}= \text{a}-\text{b}-(-5)$ $\therefore(-9)\ \Delta\ (-4)=(-9)-(-4)-(-5)$ $= -9 +4 + 5$ $= 0$
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