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 May4 asked Given a line segment. Construct an equilateral triangle with one side the given line segment. Apr29 accepted Does limit means replacing $x$ for a number? Apr29 awarded Supporter Apr29 comment Does limit means replacing $x$ for a number? So how I can do your problem ? You can make from $x^2-9$ to $(x-3)(x+3)$. Then you have only $(x-3)$. Can I replace that one ? Apr29 comment Does limit means replacing $x$ for a number? This is so difficult ! Apr29 comment Does limit means replacing $x$ for a number? so you don't replace -3 but, -2.99999999999999999999999999999999999999999999999999999999999999999999999999999‌​99999999999999999999999999999 Apr29 comment Does limit means replacing $x$ for a number? So there is problem if you get $0$ under ? Apr29 comment Does limit means replacing $x$ for a number? Noooo, I'm doing all the time wrong ? Math is more difficult than I thought ... :P Apr29 asked Does limit means replacing $x$ for a number? Apr29 comment What is the slope of the line tangent to $f(x)=-2x^2+4x+6$ when $x=3$? Thanks all of you ! Apr29 awarded Scholar Apr29 accepted What is the slope of the line tangent to $f(x)=-2x^2+4x+6$ when $x=3$? Apr29 comment What is the slope of the line tangent to $f(x)=-2x^2+4x+6$ when $x=3$? Thnank you ! I get : $\lim_{h \to 0} -4x -4h +4$ Then $-4h=0$ ? So $-4x +4$. That is $-12+4=-8$. Apr29 awarded Student Apr29 comment What is the slope of the line tangent to $f(x)=-2x^2+4x+6$ when $x=3$? You guys are so awesome ! So you just place $(x+h)$ everywhere where you see $x$. That is quite simple! :) Apr29 asked What is the slope of the line tangent to $f(x)=-2x^2+4x+6$ when $x=3$?