# A is a point on the circle x2+y2-8x-8y+28=0,B is a point on the circle x2+y2-2x-3=0.If the distance between A and B is d then

1.  1≤d≤9

2.  2≤d≤8

3.  1≤d≤5

4.  3≤d≤6

4

1≤d≤9

Explanation :
No Explanation available for this question

# The area of the circle 2x2+2y2-4x+6y-3=0 is

1.  19π/2

2.  209/41

3.  209/14

4.  19/4

4

209/14

Explanation :
No Explanation available for this question

# If α,β are the roots of ax2+bx+c=0 then αβ2+α2β+αβ=

1.  c(a-b)/a2

2.  b/c

3.  3abc-b3/a3

4.  c/a

4

c(a-b)/a2

Explanation :
No Explanation available for this question

# If the circles x2+y2+kx+y=0 and x2+y2+4x-2y=0 touch other other then k=

1.  -2

2.  2

3.  -4

4.  -1/2

4

-2

Explanation :
No Explanation available for this question

# The equation formed by the increasing each root of ax2+bx+c=0 by 1 is 2x2+8x+2=0 then

1.  a+b=0

2.  b+c=0

3.  b=c

4.  a=b

4

b=c

Explanation :
No Explanation available for this question

# Only one of the roots of ax2+bx+c=0,a≠0, is zero if

1.  c=0

2.  c=0,b≠0

3.  b=0,c=0

4.  b=0,c≠0

4

c=0,b≠0

Explanation :
No Explanation available for this question

# If α,β are the roots of ax2+bx+c=0 then the equation whose roots are 2+α,2+β

1.  ax2+x(4a-b)+4a-2b+c=0

2.  ax2+x(4a-b)+4a+2b+c=0

3.  ax2+x(b-4a)+4a+2b+c=0

4.  ax2+x(b-4a)+4a-2b+c=0

4

ax2+x(b-4a)+4a-2b+c=0

Explanation :
No Explanation available for this question

# If x

1.  Positive

2.  Negative

3.  Non negative

4.  can not be determined

4

can not be determined

Explanation :
No Explanation available for this question

# If x is real,then the maximum value of the expression 5+4x-4x2 is

1.  6

2.  -6

3.  12

4.  -12

4

6

Explanation :
No Explanation available for this question

1.  -1

2.  -2

3.  -3

4.  -10

4