need it for hw. accurate info please. gradde depends on it. thanx
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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….
-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 )
-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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