If `x + (1)/(x) = a` and ` x - (1)/(x) = b` , then `a^(2) - b^(2) = "_______"` .A. 4B. 3C. 2D. 1

If `x + (1)/(x) = a` and ` x - (1)/(x) = b` , then `a^(2) - b^(2) = "_

1.	If `x + (1)/(x) = a` and ` x - (1)/(x) = b` , then `a^(2) - b^(2) = "_______"` .A. 4B. 3C. 2D. 1
Answer» Correct Answer - A Given , `x + (1)/(x) = a` and `x - (1)/(x) = b` . Now , `a^(2) - b^(2) = (a+ b) (a-b)` `(x + (1)/(x) + x - (1)/(x) ) (x + (1)/(x) - x + (1)/(x))` `= (2x) ((2)/(x)) = 4` Hence , the correct option is (a) .

Which of the following is/are perfect squares ?A. `16a^(2) + 36b^(2) - 48 ab`B. `9x^(2) + 18xy + 9y^(2)`C. Both (a) and (b)D. Neither (a) nor (b)
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