MCQ
If a = -2, b = -1, than ab - ba is equal to:
- A0.5
- B-1
- C-2
- D-1.5
✓
Answer
- -1.5
Solution:
ab - ba
= (-2)-1 (-1)-2
$=\frac{1}{(-2)}-\frac{1}{(-1)^2}$
$=\frac{-1}{2}-1$
$=\frac{-3}{2}$
$=-1.5$
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