If a * b = a + b + ab, then 3 * 4 - 2 * 3 is equal to?
- 6
- 8
- 10
- None of these
Explanation
Let's evaluate the expressions using the given definition of a * b:
3 * 4 = 3 + 4 + (3)(4) = 3 + 4 + 12 = 19
2 * 3 = 2 + 3 + (2)(3) = 2 + 3 + 6 = 11
Now, let's subtract:
3 * 4 - 2 * 3 = 19 - 11 = 8
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