ebrushman said:After I simplify this, is there a check to know I'm right?
3y-15 / 3y+15
ebrushman said:After I simplify [3y-15 / 3y+15], is there a check to know I'm right?
You can sort of cheat with a graphing calculator: Graph the original expression as "Y1", and, on the same screen, graph your final expression as "Y2". If the two lines are the same, then you probably did the simplification correctly. :wink:Subhotosh Khan said:As far as I know, there is NO definite check for that!
ebrushman said:After I simplify [3y-15 / 3y+15], is there a check to know I'm right?
Actually, this technique gets students into a lot of trouble later on, specifically in checking trig identities.scoresofsteel said:Putting Y = 0 will be a fast way of knowing that.