Q&A for people studying math at any level and professionals in related fields

Jan 27, 2021 · Legendre's three-square theorem Ask Question Asked 5 years, 1 month ago Modified 1 year, 6 months ago

I just came across this annotation in my school's maths compendium: The compendium is very brief and doesn't explain what this means.

May 7, 2015 · $\log_2 (3) \approx 1.58496$ as you can easily verify. $ (\log_2 (3))^2 \approx (1.58496)^2 \approx 2.51211$. $2 \log_2 (3) \approx 2 \cdot 1.58496 \approx 3.16992$. $2^ {\log_2 …

Apr 20, 2016 · I understand that you can't really square on both the sides like I did in the first step, however, if this is not the way to do it, then how can you really solve an equation like this one (in …

Nov 17, 2013 · That's because the $9$ on the right hand side could have come from squaring a $3$ or from squaring a $-3$. So, when you square both sides of an equation, you can get extraneous …

If you want the negative square root, that would be $-\sqrt {4} = -2$. Both $-2$ and $2$ are square roots of $4$, but the notation $\sqrt {4}$ corresponds to only the positive square root.

Jan 2, 2022 · we can square both side like this: $ x^2= 2$ But I don't understand why that it's okay to square both sides. What I learned is that adding, subtracting, multiplying, or dividing both sides by …

Sep 21, 2017 · Simple question about square of a supremum Ask Question Asked 8 years, 5 months ago Modified 4 years, 2 months ago

May 3, 2020 · 0 I know how to find inverse of a matrix,but am having trouble solving when a non-diagonal square matrix is raised by negative power half. [1 0.4 0.4 1] [1 0.4 0.4 1] Can anyone please …