(2)
Given also that relative to a fixed origin O
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the point P has position vector 9ai – 4bj
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the point Q has position vector 6bi + 15aj
where a and b are constants,
(b) find the value of a and the value of b.
(3)
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8
*S77989A0844*
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(a) find ½PQ½, giving your answer in simplest form.
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4. Given that PQ = –3i + 12j