pls answer the ticked ones.factorize them

​Q15. 3 – 5x + 5y – 12(x – y)2

Q16. 9x2 + 3x – 8y – 64y2

Q18.  1 4 a   + b 2 - 9 16 2 a   - b 2

Q20. Find the value of :

        (i)    ( 987)2 – (13)2


        (iii)  6 . 7 2 - 3 . 3 2 6 . 7 - 3 . 3
 

18.     14a+b2 - 9162a-b2=12a+b2 - 342a-b2=12a+b +342a-b12a+b -342a-b=a2 + b2 + 3a2 - 3b4a2 + b2 - 3a2 + 3b4=2a+2b+6a-3b42a+2b-6a+3b4=1168a-b-4a+5bUsing identity : x2 - y2 = x+yx-y20.i.     9872 - 132=987+13987-13    Using identity : x2 - y2 = x+yx-y=1000 × 974=974000ii.    6.72 - 3.326.7 - 3.3=6.7+3.36.7-3.36.7-3.3       Using identity : x2 - y2 = x+yx-y=6.7+3.3=10Kindly ask the remaining queries in different threads.

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