Question 1142923
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I will disagree slightly with tutor @ikleyn (as I have done in the past) regarding her answer for part c.<br>
The meaning of "the square root of 9" does not change when you go from middle school to high school and beyond.<br>
It will cause mathematical chaos if we can say that "the square root of 9 is a set of two different values".  When we write a number like "square root of 9", it HAS TO have a single value.<br>
If we are solving the equation {{{sqrt(9)+x = 10}}}, we can't arbitrarily choose one of two different values for the square root of 9.  THE square root of 9 is 3 (whatever level of math you are at); the number -3 is {{{-sqrt(9))}}}.<br>
"3 squared is 9":  TRUE
"(-3) squared is 9":  TRUE
"The number 9 has two square roots": TRUE
"THE square root of 9 is 3 or -3":  FALSE
"THE square root of 9 is 3":  TRUE<br>
So the answer to part c is "TRUE".<br>
Example: If x = -3, then x^2 = 9; THE square root of 9 is 3, which is -x.