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perpendicular to each other. The positive vaiue ofa is:2)24)zero(3)1 |
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Answer» For this dot product should be 0. => P*Q = a*a -2a-3 = 0 => a²-2a-3 = 0=> a²-3a+a-3 = 0=> a(a-3) + 1(a-3) = 0=> (a-3)(a+1) = 0=> a = 3 , -1 |
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