please answer this
Q.11.(i) 9 x 4 - x 2 - 12 x - 36

Dear student,

We have,9x4-x2-12x-36=9x4-x2+12x+36=9x4-x2+2×x×6+62=9x4-x+62              --[using (a+b)2=a2+b2+2ab]=3x22-x+62  using a2-b2=(a+b)(a-b)=3x2+x+63x2-x-6

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