(5x+1)(5x-1)-(5x+1)²=0

Question

(5x+1)(5x-1)-(5x+1)²=0

Answer 1

25x^2-1-(5x+1)^2=0
25^2-(5x+1)^2=1
25x^2-((5x)^2-2*5x*1+1)=1
25x^2-(25x^2+10x+1)=1
25x^2-25x^2-10x-1=1
0-10x-1=1
-10x=2
x=-0.2

Answer 2

(5x+1)(5x-1)-(5x+1)²=0
(5x+1)((5x-1)-(5x+1))=0
(5x+1)(5x-1-5x-1)=0
-2 (5x+1)=0
5х+1=0
5х=-1
х=-1/5