Class VIII

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)
The number of terms in the expression 2x²+3x+5 is
  1. 1
  2. 2
  3. 3
  4. 5
The value of x2 - 5 at x= -1 is-
  1. -2
  2. -1
  3. -4
  4. -5
Which of the following is the numerical coefficient of x2y2?
  1. 0
  2. 1
  3. x2
  4. y2
"2" is common factor of the expressions
  1. 12a²b, 15ab²
  2. 5xy, 10x
  3. 10x², -18x³, 14x4
  4. 33y, -22z
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