May 7, 2015 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Upvoting indicates when questions and answers are useful. What's reputation …

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 …

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 …

May 26, 2020 · I took a look at square root. Squaring the number means x^2. And if I understood the square root correctly it does a bit inverse of squaring a number and gets back the x. I had …

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

Apr 20, 2016 · 2 You can square it like that, and the equality will still hold - remember these expressions are equal, so squaring them mean they are still equal. This can, however, …

7 Short answer: We can't simply square both sides because that's exactly what we're trying to prove: $$0 < a < b \implies a^2 < b^2$$ More somewhat related details: I think it may be a …

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

Oct 19, 2025 · If $\lambda<\sqrt 2,$ you can pick any number $>1$ of points in a unit square such that there is some pair of points with distance at least $\lambda.$ Maybe your title is wrong - it …

Oct 17, 2014 · What is the appropriate parametric equation of the boundary of a square? For example, the unit circle has a parametric equation $x(t)=\\cos(t)$ and $y(t)=\\sin(t)$.