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If 2i +pj and 4i -2j are perpendicular, find the value of p.

Further Mathematics
WAEC 2021

If 2i +pj and 4i -2j are perpendicular, find the value of p.

  • A. 2
  • B. 3
  • C. 4
  • D. 5
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Correct Answer: Option C
Explanation

(2i + pi) (4i - 2j) =0

2 x 4 - p x 2=0 ;

8-2p = 0;   2p-8;

p=4

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