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Step-by-step explanation:
[tex] = {4}^{ - 2} \times {7}^{ - 2} [/tex]
[tex] = {(4 \times 7)}^{ - 2} [/tex]
[tex] = {28}^{ - 2} [/tex]
[tex] = \frac{1}{ {28}^{2} } [/tex]