Medal if someone helps me understand this!!!!!

Look at the following expression. Are there any values of x for which the expression is not defined under the set of real numbers? Explain your reasoning.

4/sqrtx+2

Question

Medal if someone helps me understand this!!!!!

Look at the following expression. Are there any values of x for which the expression is not defined under the set of real numbers? Explain your reasoning.

4/sqrtx+2

anonymous · Answer

$$\frac{ 4 }{ \sqrt{x+2} }$$

amistre64 · Answer

there are a few major rules in math that must not be broken ... one of them is dividing by zero

amistre64 · Answer

another major rule is,  you CANNOT have a real solution to the sqrt of a negative number

anonymous · Answer

So the only number i could use is 0?

amistre64 · Answer

what we need for this to be valid is the underside part to conform to the rules:  it cant equal 0,  and the innards have to remian postivie

anonymous · Answer

yeah that i know but its asking me to plug in a number that is not real as x

amistre64 · Answer

x+2 > 0  has to fit

amistre64 · Answer

a number that aint real?

amistre64 · Answer

Are there any values of x for which the expression is not defined under the set of real numbers? 

 its asking for the domain or real

anonymous · Answer

Yeah so either 0 or an imaginary number such as 5i

amistre64 · Answer

*of real

amistre64 · Answer

its asking to restrict your results to real solution ...

anonymous · Answer

So there really arent any number to plug in that are nureal then?

anonymous · Answer

unreal

amistre64 · Answer

in other words, sqrt(-4) is not a real value :)

amistre64 · Answer

correct

anonymous · Answer

ok i understand! thanks so much.

amistre64 · Answer

your welcome

anonymous · Answer

If x+2 <= 0 the world implodes