Using a given zero to write a polynomial as a product of linear factors

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For the polynomial below, -2 is a zero. 

f(x) = x^3 - 2x^2 - 6x + 4

Express f(x) as a product of linear factors. 

Oct 16th, 2015

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f(x) = x3 + (2x2 – 4x2 ) - (8x + 2x) + 4

= x3 + 2x2 – 4x2 - 8x + 2x + 4

= (x3 + 2x2 ) – (4x2 - 8x) + (2x + 4)

= x2(x + 2) – 4x( x + 2) + 2 (x + 2)

= (x + 2)(x2 – 4x + 2)


** P/S: Please remember to give me a review later on once the answer is correct. I would be highly appreciate it. Thank you. **
Oct 16th, 2015

The answer for this question usually involves radicals if that helps any. That answer isn't correct on mine

Oct 16th, 2015

The answer for this question usually involves radicals if that helps any. That answer isn't correct on mine

Oct 16th, 2015

factor x2 – 4x + 2 = -(-x + sqrt(2) + 2)(x + sqrt(2) - 2)

Oct 16th, 2015

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