have i done this correctly? was unsure about the 18/2 part?
Given an equation of the form
we can find solutions for using the formula
Check that you have used this formula correctly. An easy way to tell if you have the right answer is to substitute your values for back into the original equation to see if you get the right answer i.e try and work out whether really equals zero. If not then you need to check your calculations carefully.
there are two problems with your solution:
1) EVERYTHING goes over the 2, not just "the square root part"
2)you should wind up with:
it's ok to leave it like this, but if you want to simplify:
.
neither:
nor are even close to either one of your "proposed" answers 2.12 or 2.45. there is no √6 involved in the correct solution.