Prove that if a; b R, then (a) -(a + b) = (-a) + (-b), (b)
Question:
(a) -(a + b) = (-a) + (-b),
(b) (-a) ∙ (-b) = a ∙ b,
(c) 1/(-a) = -(1/a),
(d) -(a/b) = (-a)/b if b ≠ 0.
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Related Book For 
Introduction to Real Analysis
ISBN: 978-0471433316
4th edition
Authors: Robert G. Bartle, Donald R. Sherbert
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