Could someone confirm if I was correct?

compare to the correct answer on the picture. If not helped you can use a graph calculator and it should let you know wether or not you’re correct

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8  

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.