Answer :

naǫ
[tex]a_1=4 \\ r=2 \\ \\ a_n=a_1 \times r^{n-1} \\ a_8=a_1 \times r^7 \\ a_8=4 \times 2^7 \\ a_8=4 \times 128 \\ \boxed{a_8=512}[/tex]

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