![\bigg[\dfrac{4\cdot t^{-1}\cdot u^6}{18\cdot t^{-2}\cdot u^{-4}}\bigg]^{-2}\\\\\\\text{simplify 4 and 18 by dividing each by 2:}\\\bigg[\dfrac{2\cdot t^{-1}\cdot u^6}{9\cdot t^{-2}\cdot u^{-4}}\bigg]^{-2}\\\\\text{distribute the exponent using the power rule (multiply the exponents):}\\\dfrac{2^{-2}\cdot t^{2}\cdot u^{-12}}{9^{-2}\cdot t^{4}\cdot u^{8}}](/tpl/images/0442/2826/0a2f1.png)
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