Answer :

If you mean for factoring, then you must take the common factor (term) out of the equation then have the rest out of what you divided
Parenthesis is () so if they said to put () it means to put those on a certain equation or numbers.
Like: 4+5-7 put with parenthesis it is (4+5) -7 or 4+ (5-7)
It's mostly in PEMDAS (Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction) problems and algebra equations!