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 Sep14 comment Prove rigorously: $\displaystyle \lim_{x\rightarrow 2}x^2+5x=14$ So it's like squaring both sides? (But multiplying by equivalents) Sep13 comment Prove rigorously: $\displaystyle \lim_{x\rightarrow 2}x^2+5x=14$ How did you find $|x-2||x+7|<(9+ \delta)\delta$? Sep12 comment Prove rigorously: $\displaystyle \lim_{x\rightarrow 2}x^2+5x=14$ $\delta>|x-2|$? Sep12 asked Prove rigorously: $\displaystyle \lim_{x\rightarrow 2}x^2+5x=14$ Sep11 accepted Derivative at 4, when $f(x)=\frac{1}{\sqrt{2x+1}}$ Sep11 comment Derivative at 4, when $f(x)=\frac{1}{\sqrt{2x+1}}$ There was an error in my question (wrong function). This is relevant. Sorry for the confusion Sep11 comment Derivative at 4, when $f(x)=\frac{1}{\sqrt{2x+1}}$ yes there is an error. will fix in a moment Sep11 asked Derivative at 4, when $f(x)=\frac{1}{\sqrt{2x+1}}$ Sep10 accepted Speed of a bicycle wheel Sep10 accepted Evaluate the limit, if it exists Sep10 accepted Correct sigma notation for an equation that sums another equation Sep10 accepted Need help figuring out $\frac{d}{dx}(x^2)|{x=3}$ Sep10 accepted Logarithmic function Sep10 accepted Number of sides on a polygon to interal angles relationship/function Sep10 accepted How to find sum of quadratic Sep10 accepted Evaluate $\tan\left(2\sin^{-1}\frac{\sqrt{5}}{5}\right)$ without using a calculator Sep10 accepted Function of $\sqrt{2+\sqrt{2+\sqrt{2+}}}\ldots$ Sep10 revised Graph single equation on calculator added 169 characters in body Sep10 revised Graph single equation on calculator edited title Sep10 asked Graph single equation on calculator