# The sum and the difference of two expressions is 5x2– x – 4 and x2+ 9x – 10, respectively, then their L.C.M. would be equal to

1.  (x – 1)

2.  (2x – 3) (3x + 7)

3.  (2x + 3) (3x + 7)

4.  (x – 1) (2x – 3) (3x + 7)

4

(x – 1) (2x – 3) (3x + 7)

Explanation :
No Explanation available for this question

# H.C.F. of two polynomials is a + 5 and their L.C.M. is (a + 5) (a + 4) (a – 1). If one of the polynomial is a2+ 4a – 5,then the other polynomial is

1.  a2+ 9a – 20

2.  a2– 9a + 20

3.  a2 + 9a + 20

4.  a2– 9a – 20

4

a2 + 9a + 20

Explanation :
No Explanation available for this question

# If p and q are real numbers; p ≠  0, then the equation 3x – 5 + q = px + 1 has no solution, if

1.  p = – 3

2.  p = 0

3.  p = 3

4.  p = 6

4

p = 3

Explanation :
No Explanation available for this question

# The length of a room is 3 metres more than its breadth.If the area of the floor of the room is 154 m2, then the length of the room is equal to

1.  14m

2.  17m

3.  11m

4.  15m

4

11m

Explanation :
No Explanation available for this question

# A certain two-digit number is equal to five times the sum of its digits. If nine were added to the number, its digits would be reversed. The sum of the digits of the number is

1.  6

2.  7

3.  8

4.  9

4

9

Explanation :
No Explanation available for this question

# The sum of two numbers added to the sum of their squares is 42. If the product of the number is 15, then the numbers are

1.  – 3 and – 5

2.  1 and 15

3.  – 1 and – 15

4.  3 and 5

4

3 and 5

Explanation :
No Explanation available for this question

# The system of equations x + 2y = 3 and 2x + 4y = 3, has

1.  a unique solution

2.  infinitely many solutions

3.  has no solution

4.  has exactly two solutions

4

has no solution

Explanation :
No Explanation available for this question

# if  α,β, γ  are the roots of the cubic equation (x – 1) (x2 + x + 3) = 0, then the value of α3+ β3 +γ3 is equal to

1.  -1

2.  9

3.  0

4.  3

4

9

Explanation :
No Explanation available for this question

# if 312*(2x)2=612, then the value of x is equal to

1.  -6

2.  -3

3.  3

4.  6

4

6

Explanation :
No Explanation available for this question

# A bus overtakes two boys who are walking in the direction of the bus at 2 km/hr and 4 km/hr in 9 sec and 10sec respectively. The length of the bus and its speed are:

1.  50m and  m/s

2.  80m and  m/s

3.  70m and  m/s

4.  60m and  m/s

4
50m and m/s