If `A=[(a,b),(c,d)]` is such that |A|=0 and `A^(2)-(a+d)A+kI=0`,then k is equal to

If A=[(a,b),(c,d)],I=[(1,0),(0,1)] then A^(2)-(a+d)A=

If A= [[a,b],[c,d]] and I= [[1,0],[0,1]] then A^(2)-(a+d)A=

If (a+3d)/(a+9d)=(a+d)/(a+5d)=k then k is equal to (a,d>0)

If A^(20) = [(a,b),(c,d)] where A =[(1,1),(0,2)] then a+b+c+d is equal to

If a,b,c,d in R-{0} , such that a,b are the roots of equation x^(2)+cx+d=0 and c,d are the roots of equation x^(2)+ax+b=0, then |a|+|b|+|c|+|d| is equal to

If a,b,c,d in R-{0} , such that a,b are the roots of equation x^(2)+cx+d=0 and c,d are the roots of equation x^(2)+ax+b=0, then |a|+|b|+|c|+|d| is equal to

If A=[[a,bc,d]] (where bc!=0 ) satisfies the equations x^(2)+k=0, then a+d=0, b.K=-|A| c.k=|A|d .none of these

If the roots of the equation a x^2+b x+c=0 are of the form (k+1)/k and (k+2)/(k+1) ,then (a+b+c)^2 is equal to 2b^2-a c b. a 62 c. b^2-4a c d. b^2-2a c

(A) "4],[" 2.If " A=[[k,1,0],[3,5]]" is a singular matrix,then the value of "k" is equal to: "],[[" (A) "0," (B) "6," (C) "-6," (D) "6]]

In the figure, if A B=A C ,/_B A D=30^0 and A E=A D , then x is equal to a) 15^0 (b) 10^0 (c) 12. 5^0 (d) 7. 5^0