Respuesta :

ahonyek
2x2 + 20x + 50=2(x^2+10x+25)
10=2*5 and 25=5*5 so we can see that this is a perfect square (x+a)^2=x^2+2a+a^2 where a=5
So 
2(x^2+10x+25)= 2(x+5)^2