Factorise `x^(4) + x^(2) + 1 . `A. `(x^(2) - x - 1) (x^(2) + x -1)`B. `(x^(2) + x + 1) (x^(2) - x + 1)`C. `(x^(2) - x + 1) (x^(2) + x)`D. `(x^(2) + x - 1) (x^(2) - 1)`

Factorise `x^(4) + x^(2) + 1 . `A. `(x^(2) - x - 1) (x^(2) + x -1)`B.

1.	Factorise `x^(4) + x^(2) + 1 . `A. `(x^(2) - x - 1) (x^(2) + x -1)`B. `(x^(2) + x + 1) (x^(2) - x + 1)`C. `(x^(2) - x + 1) (x^(2) + x)`D. `(x^(2) + x - 1) (x^(2) - 1)`
Answer» Correct Answer - B `x^(4) + x^(2) + 1` `x^(4) + 2x^(2) + 1 - x^(2)` `= (x^(2) - 1)^(2) - x^(2)` `= (x^(2) + x+1) (x^(2) - x+1)` Hence , the correct option is (b) .

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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If `3x + (1)/(x) = 6` , then find `9x^(2) + (1)/(x^(2))`.A. 24B. 27C. 30D. 33
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An equation which is true for all real values of its variables is called an identify .
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