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Factor the expression completely.

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Its a Sum of Cubes pattern:  (a+b)(a2-ab+b2)....First factor out the "9" ... 9(x+2)(x2-2x+4)


If you multiply 9(x+2)(x2-2x+4) it will give you what you the polynomial you started with.... x^2-2x+4 cannot be factored for you...the solutions are part of the complex number system...which you should see in algebra 2