Class VIII

What is the value of 5x25 - 3x32 + 2x-12 at x=1?
  1. 0
  2. 2
  3. 4
  4. None of these
Which of the following is obtained by subtracting x2-y2 from y2 - x2?
  1. . -2(x2-y2)
  2. . -2(x2 + y2)
  3. . 2(x2+ y2)`
  4. . 2(x2- y2)
What degree does x3 - x2y2 - 8y2+ 2 have?
  1. 2
  2. 3
  3. 4
  4. 7
Which of the following is the value of (x+ 1/x)2?
  1. x2 + 1/x2
  2. x2 - 1/x2
  3. x2 + 1/x2 + 2
  4. x2+ 1/x2 + 2x
Which of the following is the numerical coefficient of -5xy?
  1. 5
  2. -x
  3. -5
  4. -y
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