Let a and b be real numbers such that $a+b=-1$. Compute $a^2-b^2+a-b$.
Let a and b be real numbers such that a + b = - 1 . Compute a2−b2+a−b.
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a+b=−1 |×(a−b)a2−b2=−a+ba2−b2+a−b=0
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+148 
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