Mathematics: Algebra Online Test

The cofactor of the element '4' in the determinant
____.
4
10
– 10
– 4


this system of equations has ____.
Infinite solution
No solution
Unique solution
None of the above
The value of
if
is ____.
0
1
– 1
None of the above
If
and

then the value of
is ____.
1/3
½
1
2
If I is a unit matrix, then 3I is ____.
A unit matrix
A triangular matrix
A scalar matrix
None of the above
In a skew symmetric matrix, the diagonal elements are all ____.
Different from each other
Zero
One
None of the above
If a, b are the two roots of a quadratic equation such that a+b=24 and a-b=8,then the quadratic equation having a and b as its roots is:
x2+2x+8=0
x2-4x+8=0
x2-24x+128=0
2x2+8x+9=0
If one root of
is 4, while the equation
has equal roots, then the value of
is
49/4
4/49
4
¼