Why don't the roots of an equation agree with the equation sometimes?
86688
Why can't you square both sides of an equation?
118563
Should there be a period after an equation?
13688
Why are these numbers not equal?
84315
Why can't polynomials have negative exponents or division by a variable
143466
Roots of functions / polynomials
59160
Roots of a given equation
44799
Why is the even root of a number always positive?
105944
Position function not always returning an answer even with no apparent problems
16264
Why does $x$ divided by zero not equal $x$?
153480
Roots of a characteristic equation. Can Mathematica solve it?
1560
Shouldn't the harmonic series converge?
16474
Numerical solution to PDE seems to contradict initial values
156234
Why is the Converse to Lagrange's Theorem False?
89859
I have a problem with power equations
41204
Why do I get one extra wrong solution when solving $2-x=-\sqrt{x}$?
19
Why is the square root of a sum not equal to the square root of each its addends?
88094
Why does the Newton-Raphson method not converge for some functions?