# Focus of the parabola 4y2-20x-8y+39=0 is

1.  (6,1)

2.  (3,1)

3.  (4,1)

4.  (4,-1)

4

(3,1)

Explanation :
No Explanation available for this question

# The roots of √3x2 +10x-8√3=0

1.  Rational and equal

2.  Rational and Not equal

3.  Irrational

4.  Imaginary

4

Irrational

Explanation :
No Explanation available for this question

# Equation of the directrix of the parabola y2=5x-4y-9 is

1.  4x-1=0

2.  6x+1=0

3.  4x+1=0

4.  2x+1=0

4

4x+1=0

Explanation :
No Explanation available for this question

# If one root of the equation 8x2-6x+k =0 is the square of the other, then k =

1.  0, 3

2.  -1, 27

3.  0,-2

4.  1, -27

4

1, -27

Explanation :
No Explanation available for this question

# If (9,12) is one end of a double ordinate of the parabola y2=16x then its equation is

1.  x-9=0

2.  y-9=0

3.  y+9=0

4.  x+9=0

4

x-9=0

Explanation :
No Explanation available for this question

# If α, β are the roots of ax2+bx+c=0 then the value of (α /β –β /α)2

1.  b2 (b2-ac)/a2c2

2.  0

3.  3abc- b3/ a3

4.  c(a-b)/ a2

4

b2 (b2-ac)/a2c2

Explanation :
No Explanation available for this question

# The vertex and focus of a parabola are (2,1),(1,-1).Then the equation of the tangent at the vertex is

1.  x+2y-7=0

2.  x+2y-9=0

3.  x+2y-4=0

4.  x+2y-6=0

4

x+2y-4=0

Explanation :
No Explanation available for this question

# If x-2 is a common factor of the expression x2+ax+b=0 and x2+cx+d=0. Then b-d/c-a =

1.  -2

2.  -1

3.  1

4.  2

4

2

Explanation :
No Explanation available for this question

# If S1=0,S2=0 and S3=0 are the three circles whose radical centre is the point P,then lengths l1,l2,l3 of the tangents from P to the three circles are such that

1.  l1=l2≠l3

2.  l1≠l2≠l3

3.  l1=l2=l3

4.  l1=2l2=3l3

4

l1=l2=l3

Explanation :
No Explanation available for this question

1.  -1/5

2.  1/5

3.  34/5

4.  -34/5

4