WAEC - Further Mathematics (2021 - No. 28)

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

2

3

4

5

Uitleg

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

2 x 4 - p x 2=0 ;

8-2p = 0; 2p-8;

p=4

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