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Find |veca| and |vecb| if (veca+vecb).(v...

Find `|veca| and |vecb| if (veca+vecb).(veca-vecb)=8 and |veca|=8|vecb|.

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The correct Answer is:
`(2sqrt(2))/(3sqrt(7))`
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Find |vecb| ,if (veca+vecb) . (veca-vecb)=8 and |veca|=8|vecb| .

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If (veca+vecb).(veca-vecb)=8 and |veca|=8(vecb) then find |vecb| .

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Show that (veca-vecb)xx(veca+vecb)=2(vecaxxvecb)

Let veca,vecb,vecc be the three vectors such that veca.(vecb+vecc)+vecb.(vecc+veca)+vecc.(veca+vecb)=0 and |veca|=1,|vecb|=4,|vecc|=8, then |veca+vecb+vecc| equals :

If vecp = veca - vecb , vecq = vec a + vec b and |veca| = |vecb| = 2 , then the value of |vecp xx vecq| is equal to