11. (xy + 6) (xy-5)
15. (ab - 13) (ab - 4)
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11. (xy + 6) (xy-5)
15. (ab - 13) (ab - 4)
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Answer:
11. (xy+6)(xy-5)
= x²y²-5xy+6xy-30
= x²y²+xy-30 is the rqd. Ans.
15. (ab-13)(ab-4)
= a²b²-4ab-13ab+52
= a²b²-17ab+52
Answer:
xy(6-5)=xy
ab(-13-4)=-17ab