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)
Which of the following is the numerical coefficient of -5xy?
  1. 5
  2. -x
  3. -5
  4. -y
The factorization of 7a²+14a is
  1. 7(a+z)
  2. 21a
  3. 7(a+1)
  4. 7a(a+2)
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
What is the value of 5x25 - 3x32 + 2x-12 at x=1?
  1. 0
  2. 2
  3. 4
  4. None of these
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