X2 = k
Take square root each side.
X = (+/-) sqrt(k)
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That depends on the equation. In general, you'll try to isolate the variable, by using operations (on both sides of the equation) that get rid of anything other than the variable, on the side the variable is on.
If a statement includes an "equals" sign ( = ) then the statement is an equation. By the way . . . it may or may not be a true statement. "10 equals 120" is not true.
No.
you have to focus on your unit and try your best by the way its your teacher
Please note that in general, if you have ONE equation with TWO or more variables, there is not a unique solution. You can assign an arbitrary value for "a", replace it, then calculate what would be the corresponding value of "b". Or, probably even better, you can solve for "b" in terms of "a". Then you can assign any value to "a", and calculate the corresponding value for "b". To actually solve for "b", first solve for b2 in the usual way, that is, manipulate the equation until b2 is on the left, everything else on the right. Then take the square root on each side.