A) 6
B) 5
C) 4
D) 3
Correct Answer: B
Solution :
We have \[|\mathbf{a}+\mathbf{b}{{|}^{2}}+|\mathbf{a}-\mathbf{b}{{|}^{2}}=2(|\mathbf{a}{{|}^{2}}+|\mathbf{b}{{|}^{2}})\] \[\therefore \,\,\,25+|\mathbf{a}-\mathbf{b}{{|}^{2}}=2(9+16)\Rightarrow |\mathbf{a}-\mathbf{b}|=5\].You need to login to perform this action.
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