Can someone me with factoring by grouping x^3 + x^2 - 25x - 25 show work

Draw a tape diagram to represent each situation. for some of the situations, you need to decide what to represent with a variable andre bakes 9 pans of brownies. he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

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Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*