this one is an easy- math question.

when we dealing with math question that looks hard, sometimes what we need only a simple math technic or math faster counting method to apply.

try to evaluate the positive value of:



the answer is ...

let the value be x, so:

take square for both sides,

as you know

then:

as you can see... now we get a quadratic equation, then we simply need to solve this quadratic equation




no need to find the other one, coz we only take the positive value!
EASY RIGHT?
ALL THE BEST FOR YOU.