1
Question
−2(1−m2)−4{m2−(2−m2)}=______.
−2(1−m2)−4{m2−(2−m2)}=______.
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Solution
The correct option is D −6m2+6
−2(1−m2)−4{m2−(2−m2)}
=−2+2m2−4{m2−2+m2}
=−2+2m2−4{2m2−2}
=−2+2m2−8m2+8
=−6m2+6
−6m2+6
−2(1−m2)−4{m2−(2−m2)}
=−2+2m2−4{m2−2+m2}
=−2+2m2−4{2m2−2}
=−2+2m2−8m2+8
=−6m2+6
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