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 Sep 22 asked Solving $\lim _{x\to 1}\left(\frac{1-\sqrt[3]{4-3x}}{x-1}\right)$ Sep 22 accepted Solving $\lim_{x \to 4}\frac{3-\sqrt{5+x}}{1-\sqrt{5-x}}$ without L'Hopital. Sep 22 comment Solving $\lim_{x \to 4}\frac{3-\sqrt{5+x}}{1-\sqrt{5-x}}$ without L'Hopital. I can see why you picked $(x-4)$, but it's not clear to me why did you put a minus before $(3-\sqrt{5+x})$ and before $(1+\sqrt{5-x})$ (I'm not even sure if that's valid). Could you elaborate on your procedure? Sep 22 revised Solving $\lim_{x \to 4}\frac{3-\sqrt{5+x}}{1-\sqrt{5-x}}$ without L'Hopital. added 71 characters in body Sep 22 comment Solving $\lim_{x \to 4}\frac{3-\sqrt{5+x}}{1-\sqrt{5-x}}$ without L'Hopital. @AndréNicolas Oh, that never occurred to me. For some reason I thought I could do that only once. Thanks, I will try that. Sep 22 asked Solving $\lim_{x \to 4}\frac{3-\sqrt{5+x}}{1-\sqrt{5-x}}$ without L'Hopital. Sep 17 awarded Popular Question Sep 14 asked Evaluating $\lim _{x\to 1}\left(\frac{\sqrt[3]{x}-1}{2\sqrt{x}-2}\right)$ Aug 20 awarded Autobiographer Aug 10 accepted Getting the quadratic function given the vertex and one point. Aug 10 comment Getting the quadratic function given the vertex and one point. Excuse me, I'm not very familiar with the concept of derivatives yet. Of course, if I ignore the concept and solve the equations I will get the expected answer, but I'm not sure what you meant by $f'(x) = 2ax+b$ Aug 10 asked Getting the quadratic function given the vertex and one point. Jul 24 awarded Popular Question Jul 13 accepted Finding the acute angle between the planes $x-3y+2z=14$ and $-x+y+z=10$ Jul 13 comment Finding the acute angle between the planes $x-3y+2z=14$ and $-x+y+z=10$ What do you think about @Timbuc's comment? About $180 - 107$? Jul 13 accepted Having a plane equation equaled to zero for calculating its angle with another plane Jul 13 asked Finding the acute angle between the planes $x-3y+2z=14$ and $-x+y+z=10$ Jul 13 accepted The intersection line between $2x-5y+z=0$ and $y=0$ Jul 13 asked Having a plane equation equaled to zero for calculating its angle with another plane Jul 13 asked The intersection line between $2x-5y+z=0$ and $y=0$