Answer:
x^4 n^4
Step-by-step explanation:
(-x)^4*n^4
4 is an even power and the minus sign disappears. 4 minus signs make a plus.
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[tex]( { - xn})^{4} = ({ - x})^{4} \times ({n})^{4} = [/tex]
[tex]( { - 1})^{4} \times {x}^{4} \times {n}^{4} = {x}^{4} {n}^{4} [/tex]
