" 12."|[2x+5,3],[5x+2,9]|=0," find "x

If |[2x+5 ,3],[ 5x+2, 9]|=0 , find xdot

If |2x+5 3 5x+2 9|=0 , find xdot

3x^(2)-5x-12=0

If A=[{:(2,-3),(4," "5):}]" and "B=[{:(-1,2),(0,3):}] , find a matrix X such that A+2B+X=O.

If 3x - (1)/(3x ) =5 , find : (i) 9x^(2) + (1)/( 9x^2)

Find all zeros of the polynomial x^3-5x^2-9x-5=0 , If 2 + I is a root.

Find x ,\ y satisfying the matrix equations: [x-y 2 -2 4x6]+[3-2 2 1 0-1]=[6 0 0 5 2x+y5] (ii) [x y+2z-3]+[y4 5]=[4 9 12]

(a)If A={x in R:x^2-5x+6=0} and B={x in R:x^2=9} , find AxxB .