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The frequency  is    1 /period =    1 / [ 2 pi ]
 
 
        
             
        
        
        
Answer:
x=-5 or x=3
Step-by-step explanation:
when multiplying anything by 0, the answer will be zero
In this case, one of the two factors has to be equal to 0
start by splitting into 
(x+5) = 0
solve the equation
subtract 5 from both sides
x = -5 
now, repeat for the other binomial
x-3 = 0
add 3 to both sides
x=3