My tip: BIMDAS!
-4 squared is 16 as I have shown. And then open the brackets. (3)(16) - 3 + 5
3x16 = 48
-3+5 = 2
48 + 2 = 50
But yeah, as Ackbach said, a little 2 is a squared sign meaning to multiply it by itself.
Would you use brackets in your test? In that case...
You multiply each number in the brackets by the other brackets for example: [ (x+y)(x+y) ] would equal [ x2 + xy + xy + y2 ]. Simplifying these expressions would equal x2 + 2xy + y2
Or...
As Skeeter said you combine the expressions from...