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TBT
Lv 7
TBT asked in Science & MathematicsMathematics · 1 decade ago

To factorise x^2 + y^2 + 2y -1?

Please help to factorise x^2 + y^2 + 2y - 1

Thanks

1 Answer

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  • husoski
    Lv 7
    1 decade ago
    Favourite answer

    You can't, not with rational coefficients anyway. You could complete the square, though. That would be useful in an equation to see what sort of conic section is involved. y² + 2y is the beginning of the expansion of (y + 1)², so

    x² + y² + 2y - 1 = x² + (y + 1)² - 2

    I don't see anything else useful to do with this. Maybe someone else will?

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