Quadratic Equation Practice Question and Answer

Q:

In solving a problem, one student makes a mistake in the coefficient of the first degree term and obtains – 9 and – 1 for the roots. Another student makes a mistake in the constant term of the equation and obtains 8 and 2 for the roots. The correct equation was 

3197 0

  • 1
    x2 + 10x + 9 = 0
    Correct
    Wrong
  • 2
    x2 – 10x = 16 = 0
    Correct
    Wrong
  • 3
    x2 – 10x + 9 = 0
    Correct
    Wrong
  • 4
    None of these
    Correct
    Wrong
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Answer : 3. "x2 – 10x + 9 = 0"

Q:

If α and β are the roots of equation x2 - 2x + 4 - 0, then what is the equation whose roots are α32 and β32?

2349 0

  • 1
    $$x^2 - 4x + 8 = 0 $$
    Correct
    Wrong
  • 2
    $$x^2 - 32x + 4 = 0 $$
    Correct
    Wrong
  • 3
    $$x^2 - 2x + 4 = 0 $$
    Correct
    Wrong
  • 4
    $$x^2 - 16x + 4 = 0 $$
    Correct
    Wrong
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Answer : 3. "$$x^2 - 2x + 4 = 0 $$"

Q:

What are the roots of the quadratic equations?

  $$(x^2 + 3x - 154 = 0)$$

2166 0

  • 1
    11, 14
    Correct
    Wrong
  • 2
    11, -14
    Correct
    Wrong
  • 3
    14, -11
    Correct
    Wrong
  • 4
    14, -22
    Correct
    Wrong
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Answer : 2. "11, -14"

Q:

If the difference between the roots of the equation Ax2+BX+C = 0 is 4, then which of the following is TRUE?

2162 0

  • 1
    $$B^2 - 16A^2 = 4AC + 4B^2 $$
    Correct
    Wrong
  • 2
    $$B^2 - 10A^2 = 4AC + 6A^2$$
    Correct
    Wrong
  • 3
    $$B^2 - 8A^2 = 4AC + 10A^2 $$
    Correct
    Wrong
  • 4
    $$B^2 - 16A^2 = 4A^C + 8B^2$$
    Correct
    Wrong
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Answer : 2. "$$B^2 - 10A^2 = 4AC + 6A^2$$"

Q:

What are the roots of the equation log10(x2-6x+45) =2?

1765 0

  • 1
    9, - 5
    Correct
    Wrong
  • 2
    -9, 5
    Correct
    Wrong
  • 3
    11, -5
    Correct
    Wrong
  • 4
    -11, 5
    Correct
    Wrong
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Answer : 3. "11, -5"

Q:

α and β  is two root of a equations $$2x^2-7x+ 12=0 $$ then the value of $$ {α \over β }  + {β \over α }=? $$

1694 1

  • 1
    24
    Correct
    Wrong
  • 2
    $$ {1 \over 24 }$$
    Correct
    Wrong
  • 3
    12
    Correct
    Wrong
  • 4
    $$ {1 \over 12 }$$
    Correct
    Wrong
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Answer : 2. "$$ {1 \over 24 }$$"

Q:

If α and β are the roots of the equation x2 + x - 1 = 0, then what is the equation whose roots are and α5 and β

1514 0

  • 1
    $$x^2 - 11x - 1 = 0 $$
    Correct
    Wrong
  • 2
    $$x^2 + 11x - 1 = 0$$
    Correct
    Wrong
  • 3
    $$x^2 + 7x - 1 = 0 $$
    Correct
    Wrong
  • 4
    $$x^2 - 7x- 1 = 0 $$
    Correct
    Wrong
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Answer : 2. "$$x^2 + 11x - 1 = 0$$"

Q:

In equation $$ {x^{2}-24x+k=0}$$ the first root is x=2 then find out  the second root of equation.

1483 0

  • 1
    x=-22
    Correct
    Wrong
  • 2
    x=12
    Correct
    Wrong
  • 3
    x=22
    Correct
    Wrong
  • 4
    x=-12
    Correct
    Wrong
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Answer : 3. "x=22"

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