Question

[(4)-1 - (5)-1]2 x (5/8)²
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Answer 1

$[(4)-1 - (5)-1]2 \times { (\frac{5}{8} )}^{2} \\ (4 - 1 - 5 - 1)2 \times \frac{25}{64} \\ - 3 \times 2 \times \frac{25}{64} \\ - 3 \times \frac{25}{32} = \frac{ - 75}{32}$

Hope this will be helpful.