exam Maths Puzzle Numerical Ability

I AM HAVIING A PROBLEM WITH THE BASIC ALGEBRA PLEASE HELP STARTING FROM FRACTIONS ON UP

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The Instructor of an introductory computer course wants to make a wall chart of a computer desktop for her students. To make it as relistic as possible, she would like the desktop I dont understand

"The degree three polynomial f(x) with real coefficients and leading coefficient 1, has 4 and 3+i among its roots. Express f(x) as a product of linear and quadratic polynomials with real coefficients."