Question

решите уравнение (5х+1)(5х-1)-(5х+1)^2=0

Answer 1

(25х^2-1)-(25х^2+10х+1)=0;
25х^2-1-25х^2-10х-1=0;
-10х-2=0;
-10х=2;
х=-2/10;
х=-1/5;
х=-0,2