- #1
kenewbie
- 239
- 0
[tex]
\lim_{x\to 2}\frac{3x^2-12}{x-2} = \lim_{x\to 2}\frac{3(x-2)(x+2)}{x-2} = \lim_{x\to 2}\frac{3(x+2)}{1} = 3*(2+2) = 12
[/tex]
This gives the exact same result as reducing the expression would do.
[tex]
\frac{3x^2-12}{x-2} = 3(x+2)
[/tex]
I can see nothing but benefits by doing this, I get the same values for all X, and at x = 2 I no longer have a division by zero, rather I get 12 (which is the limit of the original expression at x = 2 anyway).
So what do I need the limits for? All the examples my book has of limits can be solved by simply reducing the expression to a simpler form instead.
Is my book just bad?
k
\lim_{x\to 2}\frac{3x^2-12}{x-2} = \lim_{x\to 2}\frac{3(x-2)(x+2)}{x-2} = \lim_{x\to 2}\frac{3(x+2)}{1} = 3*(2+2) = 12
[/tex]
This gives the exact same result as reducing the expression would do.
[tex]
\frac{3x^2-12}{x-2} = 3(x+2)
[/tex]
I can see nothing but benefits by doing this, I get the same values for all X, and at x = 2 I no longer have a division by zero, rather I get 12 (which is the limit of the original expression at x = 2 anyway).
So what do I need the limits for? All the examples my book has of limits can be solved by simply reducing the expression to a simpler form instead.
Is my book just bad?
k