meee simplify. 25√+35√−5√

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11