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Question : 71 of 160
Marks:
+1,
-0
Solution:
Calculate the value of (ab)
|a+b|=5 |a+b|2=25 (a+b)(a+b)=25 |a|2+2ab+left|b2‌right|=25 9+2ab+16=25 2ab=0 ab=0 The magnitude of vector
|−| is calculated as
|−|2=||2+||2−2 =9+16−0 =25 |−|=5
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