factorise , plz answer this question
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Q: FACTORISATION ?
A: (a^2 + 1) (a - b^2)
EXPLANATION/SOLUTION.
= a^3 - b ^2 + a - a^2 b^2
ARRANGE
= a^3 + a - b^2 - a^2b^2
= a (a^2 + 1) -b^2 (1 + a^2)
= (a^2 + 1) (a-b^2) ANS
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