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I was born to answer lhfs.


21h
revised Adding $2$ absolute values together: $|x+2| + |x-3| =5.$
deleted 3 characters in body
21h
answered Adding $2$ absolute values together: $|x+2| + |x-3| =5.$
Aug
2
comment What are some good questions for this trick, if $\frac{a}{b}=\frac{c}{d}=\frac{e}{f}=\dots=\alpha$ then $\alpha=\frac{a+c+e+…}{b+d+f+…}$?
Do you happen to have a copy of Higher Algebra by Hall and Knight? It contains quite a few of these in the first chapter.
Jul
2
awarded  Curious
Jun
26
comment Trigonometry / Finding the exact value
Do you understand that that the cosine function obtains the same value every $2\pi$?
Jun
24
answered Problem of quadratic equation
Jun
24
awarded  Yearling
Jun
20
awarded  Nice Answer
Jun
5
comment How do you solve this using only given values, logarithm rules and no calculator?
You can introduce $\log(2)$ easily. $\log(4) = 2\log(2)= 0.6021 $.
Jun
3
revised How do I prove $\frac{ \sqrt{x+h}-\sqrt{x} }{ h}=\frac{1}{\sqrt{x+h}+\sqrt{x}}$?
edited tags
May
22
comment Inequality involving conjugate numerator/denominator pairs
Are you there? Chat is up now.
May
22
comment Inequality involving conjugate numerator/denominator pairs
I would explain the full process to you, but the chat is offline. You can cancel the $x^3$ as a start.
May
20
comment Inequality involving conjugate numerator/denominator pairs
Yes, that's just the wavy-curve method. It's just that you put alternate + and - between the intervals.
May
20
comment Inequality involving conjugate numerator/denominator pairs
Don't worry. Do you know how to solve $(x + 2)(x + 4)(x + 7) < 0$ otherwise, without expanding it into a polynomial?
May
20
comment Inequality involving conjugate numerator/denominator pairs
$(x+2)(x+4)(x+7) < 0$ is another way to say that something is negative. Have you ever used the wavy-curve method?
May
20
comment Inequality involving conjugate numerator/denominator pairs
Corrected it. By the way, you should use the second method.
May
20
revised Inequality involving conjugate numerator/denominator pairs
edited body
May
20
answered Inequality involving conjugate numerator/denominator pairs
May
18
comment Evaluate the limit with Taylor series
Scroll down. chat.stackexchange.com/transcript/13574/2014/4/7
May
18
comment Evaluate the limit with Taylor series
Rob... ${}{}{}$