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If a=hati+2hatk+3hatk, b=-hati+2hatj = hatk and c=3hati+hatj, then p such that a+pb is at right angle to c will be |
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Answer» 7 `therefore (a+pb)*c=0 RARR a*c+p(b*c)=0` `rArr 5-p=0 ` `[ because a*c = 3+2 = 5 and b*c=-3+2 = -1] ` `therefore p = 5` |
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