While calculating square roots of some functions,why do we usually ignore the negative values?For example while I was solving a question of quadratic equations,the value of a function f(x)=(x4+20)1/2 came out to be 6 and -7.When I saw the solution, it had stated that f(x) will not be -7.Why?

Manas Mishra , 6 Years ago

Grade 12th Pass