WAEC - Further Mathematics (2021 - No. 19)
In △PQR, \(\overline{PQ}\) = 5i - 2j and \(\overline{QR}\) = 4i + 3j. Find \(\overline{RP}\).
-i - 5j
-9 - j
i + 5j
-9i + j
Giải thích
\(\overline{PQ}\) = 5i - 2j; \(\overline{QR}\) = 4i + 3j
\(\overline{RP}\) = \(\overline{PQ}\) - \(\overline{QR}\)
= 5i - 2j - [4i + 3j] = 5i - 2j - 4i - 3j
= i - 5j