25х+14х-3=039x-3=039x=0+3x=
<span> (√2+√8)^2-(√2-√8)^2=[√2+√8-√2+√8](√2+√8+√2-√8)=2V4*2 +2V2=4V2+2V2=6V2</span>
I hope this helps you