To expand this we multiply the first term in each bracket together to get x^{2 } Then we do the first bracket's first term by the second bracket's second term to get -5x The we do the first bracket's second term by the first, then the second, terms of the second bracket to get 4x -20 Together that makes x^{2 }- 5x + 4x - 20 and we can simplify this to get x^{2 }- x + 20 which is the answerTo remember how to expand you can use the acronym FOIL, multiplying the First, Outside, Inside, Last terms together before simplifying.