ICSE Board Practice

ICSE Grade VIII - Quadratic Equations
Question 1
1.
    • Solve :
    •  
       
      9
      x
      2
        +  
       
       
      12
      a
      b
      x
        +  
       
       
      4
      a
      2
      b
      2
    • = 0
  •  
     
    6
    a
    b

     
     
    11
    ,
     
     
    2
    a
    b

     
     
    5
  •  
     
    2
    a
    b

     
     
    3
    ,
     
     
    2
    a
    b

     
     
    3
  •  
     
    4
    a
    b

     
     
    9
    ,
    0
  •  
     
    8
    a
    b

     
     
    9
    ,
     
     
    4
    a
    b

     
     
    3
  •  
     
    6
    a
    b

     
     
    7
    ,
     
     
    2
    a
    b
Question 2
2.
    • Solve :
    •    
       
       
      5

       
       
      (
      x
      2
      )
         
       
       
      3

       
       
      (
      x
      1
      )
      =
       
       
      5

       
       
      (
      x
      2
      )
  • 4

    3



    4
    ,
    (
    8



    4
    )
  • 4

    3



    5
    ,
    (
    8



    5
    )
  • 4

    3



    2
    ,
    (
    8



    2
    )
  • 4

    3
    ,
    (
    8
    )
  • 4

    3



    3
    ,
    (
    8



    3
    )
Question 3
3.
    • Solve the quadratic equation
    •  
       
      x
         
       
       
      45

       
       
      x
      =
         
       
       
      4
  • (
    7
    ,
    -10
    )
  • (
    6
    ,
    -10
    )
  • (
    7
    ,
    -12
    )
  • (
    6
    ,
    -9
    )
  • (
    5
    ,
    -9
    )
Question 4
4.
    • Find the discriminant of the quadratic equation
    • (
      x
      2
       
      2
      x
      )
      =
      0
  • 2
  • 3
  • 6
  • 5
  • 4
Question 5
5.
    • Find the roots of the quadratic equation
    • (
      30
      x
      2
       
      +
      x
      20
      )
      =
      0
  • (
    6

    5
    ,
    (
    -7

    6
    )
    )
  • (
    6

    5
    ,
    (
    -5

    4
    )
    )
  • (
    4

    7
    ,
    (
    -5

    4
    )
    )
  • (
    4

    7
    ,
    (
    -5

    6
    )
    )
  • (
    4

    5
    ,
    (
    -5

    6
    )
    )
Question 6
6.
    • Solve :
    •    
       
       
      5

       
       
      (
      x
      +
      3
      )
         
       
       
      2

       
       
      (
      x
      +
      4
      )
      =
       
       
      4
  • 3



    3
    ,
    (
    4



    3
    )
  • 3



    2
    ,
    (
    4



    2
    )
  • 3
    ,
    (
    4
    )
  • 3



    4
    ,
    (
    4



    4
    )
  • 3



    5
    ,
    (
    4



    5
    )
Question 7
7.
    • Find the roots of the quadratic equation
    • (
      72
      x
      2
       
      +
      4
      x
      20
      )
      =
      0
  • (
    1

    4
    ,
    (
    -5

    7
    )
    )
  • (
    1

    4
    ,
    (
    -5

    9
    )
    )
  • (
    1

    2
    ,
    (
    -5

    9
    )
    )
  • (
    3

    2
    ,
    (
    -7

    9
    )
    )
  • (
    3

    2
    ,
    (
    -5

    7
    )
    )
Question 8
8.
    • Find the roots of the quadratic equation
    • (
      x
      2
       
      6
      x
      +
      5
      )
      =
      0
  • (
    8
    ,
    0
    )
  • (
    6
    ,
    0
    )
  • (
    5
    ,
    1
    )
  • (
    8
    ,
    -2
    )
  • (
    6
    ,
    1
    )
Question 9
9.
    • Find the roots of the quadratic equation
    • (
      x
      2
       
      +
      6
      x
      +
      8
      )
      =
      0
  • (
    0
    ,
    -6
    )
  • (
    -2
    ,
    -4
    )
  • (
    0
    ,
    -5
    )
  • (
    -1
    ,
    -4
    )
  • (
    -1
    ,
    -5
    )
Question 10
10.
    • Solve :
    • (
      7
      x
      +
      6
      )

      (
      4
      x
      +
      5
      )
    • =
    • (
      9
      x
      +
      2
      )

      (
      5
      x
      +
      4
      )
  • (
    2
    ,
    -7
    )
  • (
    -3
    ,
    6
    )
  • (
    1
    ,
    10
    )
  • (
    -5
    ,
    5
    )
  • (
    -2
    ,
    7
    )