Question

Factorise: *

1 point



Factorise: *

1 point


Factorise: (2x+5y)²-1​

Factorise: (2x+5y)²-1​​

Answer 1

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

please mark me down as a brain liest

Answer 2

Answer:

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

Step-by-step explanation:

$(2x+5y)^2 -(1)^2\\(1 can \ be \ written \ as \ (1)^2)\\Therefore, (2x+5y+1)(2x+5y-1)\\Using \ identity \ a^2+b^2=(a+b)(a-b)$