Question

Simplique : a) -x2 +1 - ( x2 + 2) b) y2 - ( 2 ) c) - (z2 - x - xy) d) - (x+1) + (x+1)

Answer 1

a) - x² + 1 - (x² + 2) =
    - x² + 1 - x² - 2 =
    - 2x² - 1 
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b) y² - (2) =
    y² - 2
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c) - (z² - x - xy) = 
   - z² + x + xy
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d) - ( x + 1) + (x + 1) =
    - x - 1 + x + 1 =
    - x + x - 1 + 1 = 0