If vector P =6i + 8j and of Q =4i -3j ,then calculate the magnitude of P,Q,P+Q,P- Q,Q- P,P.Q ,P× Q
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|P|=√6²+8²=√36+64=√100=10
|Q|=√4²+3²=√5²=5
|P+Q|=|10i+5j|=√10²+5²=√100+25=√125=√25×5=5√5
|Q-P|=|-2i-11j|=√2²+11²=√4+121=√125=√25×5=5√5
|P.Q|=|6×4+8×-3|=|24-24|=0
|P×Q|=|i j k|
|6 8 0|
|4 -3 0|
=|k(-18-24)|
=|-42k|
=√(-42)²
=√42²
=42
if answer is wrong I am sorry
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