Equation Questions Practice Question and Answer

Q:

If  $$  \left( x^2+{1\over x^2} \right)- \left( x - {1\over 4} \right)- 7 =0 $$ then two value of x are :

939 0

  • 1
    1, 2
    Correct
    Wrong
  • 2
    $$ 2, -{1\over 2} $$
    Correct
    Wrong
  • 3
    0, 1
    Correct
    Wrong
  • 4
    $$ {1\over 2} , 1 $$
    Correct
    Wrong
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Answer : 2. "$$ 2, -{1\over 2} $$"

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 

2712 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"

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Answer : 4. "D"

Q:

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

1673 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:

If one root of the equation Ax2+Bx+C = 0 is two and a half times the others, then which of the following is TRUE? 

1001 0

  • 1
    $$7B^2= 3 CA $$
    Correct
    Wrong
  • 2
    $$7B^2 = 4 CA$$
    Correct
    Wrong
  • 3
    $$7B^2 = 36 CA $$
    Correct
    Wrong
  • 4
    $$10B^2 = 49 CA $$
    Correct
    Wrong
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Answer : 4. "$$10B^2 = 49 CA $$"

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?

1966 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 equation log10(x2-6x+45) =2?

1416 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"

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Answer : 1. "A"

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