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Let a and b be real numbers such that a + b = -1.  Compute a^2 - b^2 + 2a.

 Aug 9, 2021
 #1
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See https://web2.0calc.com/questions/algebra_63536

 Aug 9, 2021
 #2
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a^2 - b^2 + 2a = (a + b)(a - b) + 2a 

substitute a + b = -1

-1(a - b) + 2a = -a + b + 2a = a + b = -1.

 Aug 9, 2021

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