Factorise each of the following: 16 (x + y)² – 25 (x – 3y)² using identites
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Answer:
16(x+y)2 -25(x-3y)2
{4(x+y)}2 -{5(x-3y)}2
(4x+4y)2 -(5x-15y)2
(4x+4y+5x-15y) (4x+4y-5x+15y)
(9x-11y) (-x+19y)
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