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Question : 168 of 180
Marks:
+1,
-0
Solution:
‌‌ Here, ‌a+3b‌=++2+3(3+2−)=‌10+7−‌‌ and ‌2a−b=2(++2)−(3+2−)=−+5‌(a+3b)⋅(2a−b)‌=(10+7−)⋅(−+5)‌=10×(−1)+7×0+−1×5=−15
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