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If the scalar product of the vector hati+hatj+2hatk with the unti vector along mhati+2hatj+3hatk is equal to 2, then one of the value of m is |
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Answer» 3 `implies m+2+6=2sqrt(13+m^(2))` `implies (m+8)^(2)=4(13+m^(2))` `implies m^(2)+16M+64 =4M^(2)+52` ` implies 3m^(2)-16m - 12=0 ` `implies(3m+2)(m-6)=0` `implies m=6,-(2)/(3)` |
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