Question

(2x+5y)^2-1 factorise ​

Answer 1

Answer:

this is your answer

Step-by-step explanation:

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

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

Answer 2

Answer:

(2x+5y)^2-1

It is the form of (a+b)^2 -1

(a+b)^2=a^2+2ab+b^2 -1

(2x)^2+2×2x×5y+(5y)^2-1

4x^2+20xy+25y^2-1