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The polynomial 
p(x)=5x^(3)-9x^(2)-6x+8 has a known factor of 
(x+1).
Rewrite 
p(x) as a product of linear factors.

p(x)=

The polynomial p(x)=5x39x26x+8 p(x)=5 x^{3}-9 x^{2}-6 x+8 has a known factor of (x+1) (x+1) .\newlineRewrite p(x) p(x) as a product of linear factors.\newlinep(x)= p(x)=

Full solution

Q. The polynomial p(x)=5x39x26x+8 p(x)=5 x^{3}-9 x^{2}-6 x+8 has a known factor of (x+1) (x+1) .\newlineRewrite p(x) p(x) as a product of linear factors.\newlinep(x)= p(x)=
  1. Factor Finding: Since we know that (x+1)(x + 1) is a factor of p(x)p(x), we can use polynomial long division or synthetic division to divide p(x)p(x) by (x+1)(x + 1) to find the other factors.
  2. Synthetic Division: Let's perform synthetic division using the root of the known factor, which is x=1x = -1.\newlineWe set up the synthetic division as follows:\newline1-1 \,| 55 9-9 6-6 88\newline0\phantom{0}000000000\underline{\phantom{0}\phantom{0}\phantom{0}\phantom{0}\phantom{0}\phantom{0}\phantom{0}\phantom{0}\phantom{0}}\newline0\phantom{0}0\phantom{0}55 1-122 88 1-144\newlineWe bring down the 55, multiply it by 1-1 to get 1-177, and add it to 9-9 to get 1-122. We then multiply 1-122 by 1-1 to get \,|22, and add it to 6-6 to get 88. Finally, we multiply 88 by 1-1 to get \,|77, and add it to 88 to get 1-144, which confirms that 5500 is a factor since the remainder is 1-144.
  3. Quotient Polynomial: The result of the synthetic division gives us the coefficients of the quotient polynomial, which is 5x214x+85x^2 - 14x + 8.\newlineSo, p(x)p(x) can be written as (x+1)(5x214x+8)(x + 1)(5x^2 - 14x + 8).
  4. Factoring Quadratic Polynomial: Now we need to factor the quadratic polynomial 5x214x+85x^2 - 14x + 8. We can try to factor it by looking for two numbers that multiply to 5×8=405 \times 8 = 40 and add up to 14-14.
  5. Grouping and Factoring: The two numbers that satisfy these conditions are 10-10 and 4-4, since (10)×(4)=40(-10) \times (-4) = 40 and (10)+(4)=14(-10) + (-4) = -14.\newlineSo we can write the quadratic as 5x210x4x+85x^2 - 10x - 4x + 8.
  6. Common Factor Extraction: Now we can factor by grouping. We group the terms as follows: (5x210x)+(4x+8)(5x^2 - 10x) + (-4x + 8).
  7. Complete Factoring: We factor out the common factors from each group: 5x(x2)4(x2)5x(x - 2) - 4(x - 2).
  8. Final Result: Since both terms have a common factor of (x2)(x - 2), we can factor it out to get (5x4)(x2)(5x - 4)(x - 2).
  9. Final Result: Since both terms have a common factor of (x2)(x - 2), we can factor it out to get (5x4)(x2)(5x - 4)(x - 2).Now we have factored p(x)p(x) completely into linear factors: p(x)=(x+1)(5x4)(x2)p(x) = (x + 1)(5x - 4)(x - 2).

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