New posts in algebra-precalculus

Prove that if $({x+\sqrt{x^2+1}})({y+\sqrt{y^2+1}})=1$ then $x+y=0$

How do you factor a quadratic expression, without using the formula?

Radical equation $\sqrt{x+1}+\sqrt{x-1}-\sqrt{x^2 -1}=x$

Proof of an inequality using analytic geometry

The sum of powers of $2$ between $2^0$ and $2^n$

Number Theory or Algebra?

summation of determinants of $3\times3$ matrices

A very small disc winds around a larger circular disc of radius $R$ connected to it by a string. How long is the spiral it travels?

Khayyam's work on cubic equations

Derivative of a quotient inside a square root

Find the value of $x_1^6 +x_2^6$ of this quadratic equation without solving it

How can we composite two piecewise functions?

Why is the slope of a line defined the way it is.

Sum of reciprocals of the triangle numbers

Solve $\sqrt{1 + \sqrt{1-x^{2}}}\left(\sqrt{(1+x)^{3}} + \sqrt{(1-x)^{3}} \right) = 2 + \sqrt{1-x^{2}} $

A possible solution to $\sqrt {5-x}=5-x^2$ (without taking square from both sides)

An Interesting Question I Posed to Myself About $\pi$ as an Average.

Sum the series $\frac{3}{1⋅2⋅4}+\frac{4}{2⋅3⋅5}+ \frac{5}{3⋅4⋅6}+...\text{(upto n terms)}$

Proving if it is possible to write 1 as the sum of the reciprocals of x odd integers

What is the constant function, exactly?