1/2............................................ I hope this helps
2x^2-7=4
subtract 4 from both sdies
2x^2-11=0
therefor
2x^2=11
divide by 2
x^2=5.5
square root both sdies
x=-2.345 or 2.345
Both mean to factor, I've never heard of a difference
Hold on just have to type before I can see the question