If left begin array cc x amp 3 2 amp 7 end arra... - JAMB Mathematics 2010 Question
If \(\left[\begin{array}{cc}
x & 3\\ 2 & 7\end{array}\right]\)= 15 find the value of x
x & 3\\ 2 & 7\end{array}\right]\)= 15 find the value of x
A
3
B
4
C
5
D
2
correct option: a
(\left[\begin{array}{cc}
x & 3\
2 & 7\end{array}\right])= 15
x x 7 - 2 x 3 = 15
7x - 6 = 15
7x = 15+6
7x = 21
x = 21/7
x = 3
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