Class VIII

Which of the following is the numerical coefficient of x2y2?
  1. 0
  2. 1
  3. x2
  4. y2
a2-b2 is a product of
  1. (a+b)(a-b)
  2. (a+b)(a+b)
  3. (a-b)(a-b)
  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 is the product of (x+a) and (x+b)?
  1. x2+ (a-b)x + ab
  2. x2 + (a+b)x - ab
  3. x2 + (a+b)x - ab
  4. x2 + (a+b)x + ab
The coefficient of x in the expression -7x +5 is
  1. 5
  2. -7
  3. 7
  4. X
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