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Question
Simplify : −3 (1 − x2) − 2{x2 − (3 − 2x2)}
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Solution
−3 (1 − x2) − 2 {x2 − (3 − 2x2)}
= −3 + 3x2 − 2 {x2 − 3 + 2x2}
= −3 + 3x2 − 2{3x2 − 3}
= −3 + 3x2 − 6x2 + 6
= 3 − 3x2
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