Question

Factorise: (2x+5y)²-1​

Answer 1

⇒(2x+5y)^2-(1)^2 {Using identity a^2-b^2 = (a+b)(a-b)}

⇒(2x+5y+1)(2x+5y-1)

Answer 2

Answer:

(2x+5y)+(2x+5y)-1

2x+2x+5y+5y-1

4x+10y-1

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