Question

What is the positive solution to the equation x² + 5 = 21?

Answer 1

The x² + 5 = 21 can be solved as.

$\begin{gathered} x^2+5=21 \\ x^2=21-5 \\ x^2=16 \\ x=\pm\sqrt[]{16} \\ x=\pm4 \end{gathered}$

So, the positive solution to the equation x² + 5 = 21 is x=4.