Find x if '|[4,3,9],[3,-2,7],[11,4,x]|=0'
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value of X is 11
Given:
matrix
[4,3,9],[3,-2,7],[11,4,x]
DETERMINANT of this 3x3 matrix is zero so
solving
by using determinant finding method
4 x ( 7*4 - -2*x) - 3( 11*7 - 3x) + 9 (3*4 - 11* -2) = 0
=> 4x (28 + 2x) - 3 ( 77 - 3x ) + 9 (12 + 22) = 0
=> 112 + 8x - 231 +9x + 108 + 198 = 0
=> 187 + 17x = 0
=> x = 11
#SPJ1
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