If →a,→b,→c are non-zero vectors such that →a⋅(→b+→c)=→c⋅(→a+→b), then which of the following can be true ?
A
→a=→b
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B
→a⊥(→b−→c)
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C
→a=→c
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D
→b⊥(→a−→c)
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Solution
The correct option is D→b⊥(→a−→c) Given; →a⋅(→b+→c)=→c⋅(→a+→b)⇒→a⋅→b+→a⋅→c=→c⋅→a+→c⋅→b⇒→b⋅(→a−→c)=0[∵→a⋅→c=→c⋅→a] ⇒→a−→c=→0 or →b⊥(→a−→c)[∵→b≠→0] ∴→a=→c or →b⊥(→a−→c)