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I assume you want to simplify the expression. Take a pair of parenthesised factors and multiply them out:


Now multiply this result by another factor x+4:

x³+5x²+  6x+


And multiply this by the last factor x+5:

x⁴+9x³+26x²+  24x+


Finally, subtract 48: x⁴+14x³+71x²+154x+72.

by Top Rated User (614k points)

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