Qno 12 and 13 class 9 icse mathematics
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(2-x) (2+x) (4+x2)
Using identity (a+b) (a-b) =a2-b2
=[(2)2-x2] (4+x2)
=4-x2+4+x2
=8
Using identity (a+b) (a-b) =a2-b2
=[(2)2-x2] (4+x2)
=4-x2+4+x2
=8
Answered by
1
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