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2 Comments Already

mygif
james Said,
January 24th, 2011 @10:08 am  

hey..do u mean..b2 -4ac ?discriminant?that answer should be positive because v r all dealing with positive there….real numbers n not imaginary….if its imaginary n square root goes to get some answer with ‘i’ attached to it…(-b+/-sq(b^2-4ac))/2a…right?advantage…it can accurately find roots of given equation with degree 2…basically…n disadvantages…it cant go beyond a degree..thats an equation with ‘cubic’term in it wont help much unless…those bigger equations needs a real number when substituting that real number for the variable shud yield zero to say thats t roots for tht equation…b2-4ac is equated to zero….

mygif
Katie C Said,
January 24th, 2011 @10:21 am  

Advantages:
-As long as you use it correctly, it always gives you the right answer.
-There are times when it is the only way to get an exact answer. (example (1 + sqrt(5)]/2 )

Disadvantages:
-It takes a long time to compute (for me personally) so if you are crunched for time during a test, it’s maybe not the best way to go.
-There’s a lot of chances to mess up on your arithmetic
-Some math instructors don’t like it when students resort to using the quadratic formula when they could factor or complete the square.
-Its hard to remember, if you don’t have it on hand

If you know when to use it and use it appropriately, then most of these disadvantages go away. ;-) So really it is up to you and what you feel most comfortable with.
(Personally, I don’t like it much and I think of it as a last resort. I wish they only taught it to students after they learned alternative methods for solving quadratics.)

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