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Apr
21
comment Prove this inequality $25ab+25a+10b\le38$
+1 for making it simple!
Apr
21
comment Prove this inequality $25ab+25a+10b\le38$
Hint: Put $b=\sqrt{1-a^2}$. And substitute $b$ in given expression. Afterwards obtain an equation $f(a)$, and find maxima and minima by using derivative tests.
Apr
21
comment Approximation of an expression (no calculator please!)
Seriously, one needs great persistence to attempt this one with the first method, I even tried it but dropped it in the mid-way thinking that this would take took long. Anyway thanks!
Apr
21
revised Approximation of an expression (no calculator please!)
added 2 characters in body
Apr
21
comment Approximation of an expression (no calculator please!)
@RossMillikan I guess from the phrase "just equal to" they meant that we will be needing a minor approximation. Although answer approximation isn't that much minor. You can freely blame the question.
Apr
21
comment Approximation of an expression (no calculator please!)
@Paul Thanks! I didn't know that.
Apr
21
asked Approximation of an expression (no calculator please!)
Apr
16
revised Quotient group(Factor group)
mathjax added;
Apr
16
suggested approved edit on Quotient group(Factor group)
Apr
15
revised Why non-real means only the square root of negative?
mathjax added;
Apr
15
suggested approved edit on Why non-real means only the square root of negative?
Apr
15
awarded  Benefactor
Apr
15
accepted Why non-real means only the square root of negative?
Apr
14
accepted Find remainder when $2^{30}\cdot 3^{20}$ is divided by $7$ without using calculator
Apr
14
revised Find remainder when $2^{30}\cdot 3^{20}$ is divided by $7$ without using calculator
mathjax added;
Apr
14
suggested approved edit on Find remainder when $2^{30}\cdot 3^{20}$ is divided by $7$ without using calculator
Apr
13
awarded  Promoter
Apr
9
revised Analysis of how-many-squares and rectangles are are there on a chess board?
mathjax added;
Apr
9
suggested approved edit on Analysis of how-many-squares and rectangles are are there on a chess board?
Apr
5
revised General solution of $y''+y'=0$
mathjax fixed;