What should be subtracted from x^2 - xy + y^2 to make it perfect square?
- -xy
- xy
- Both A and B
- None of these
Explanation
To make x² - xy + y² a perfect square, we need to add or subtract a term that will complete the square.
Recognize that:
x² - 2xy + y² = (x - y)²
However, the given expression is:
x² - xy + y²
To match the perfect square form, we need to subtract:
xy
So, subtracting xy will make it:
x² - 2xy + y² = (x - y)²
Related MCQs
- 2x² + 4 = 9x
- 2x² + 9 = 4x
- 2x² + 9 = 4x
- x² + 4 = 9x
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