In order to use the remainder theorem, you need to have some idea what to divide by. The rational root theorem tells you rational roots will be from the list derived from the factors of the constant term, {±1, ±5}. When we compare coefficients of odd power terms to those of even power terms, we find their sums are equal, which means -1 is a root and (x +1) is a factor.
Dividing that from the cubic, we get a quotient of x² +6x +5 (and a remainder of zero). We recognize that 6 is the sum of the factors 1 and 5 of the constant term 5, so the factorization is
... = (x +1)(x +1)(x +5)
... = (x +1)²(x +5)
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The product of factors (x +a)(x +b) will be x² + (a+b)x + ab. That is, the factorization can be found by looking for factors of the constant term (ab) that add to give the coefficient of the linear term (a+b). The numbers found can be put directly into the binomial factors to make (x+a)(x+b).
When we have 1·5 = 5 and 1+5 = 6, we know the factorization of x²+6x+5 is (x+1)(x+5).
Answer: The expression will be 
Step-by-step explanation: Frank has to pay $50 as the registration fee. This amount is compulsory to be paid
Step 1: Dues for $12 months
Let the due to be paid every month be $x, so dues to be paid for 12 months will be 12x
Step 2: Expression for the average monthly cost for x-month will be
Expression: 
Total cost = 50 + 12x
Expression: 
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15 percent of 359 is 53.85
subtract 359 minus 53.85 and you get 305.15