Simplify : ( 2a2 - 2b2) - ( a2 - b2 ) a) a2 - b2 b) 3a2 - 3b2 c) 3a2 + 3b2 d) a2 + b2
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(2a² – 2b²) – (a² – b²)
= 2a² – 2b² – a² + b²
= 2a² – a² – 2b² + b²
= a² – b²
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