(7x⁶+7)/8x³ = 7(x⁶+1)/8x³ =7/8 · (x⁶+1)/x³ = 7/8 · (x³+1/x³) = 7/8 · (x +1/x)(x² - 1 + 1/x²) =
= 7/8 · (x +1/x)(x² + 2 + 1/x² - 3) = 7/8 · (x +1/x)((x + 1/x)² - 3) = 7/8 · (-2)((-2)² - 3) =
= 7/8 · (-2)(4 - 3) = 7/8 · (-2) · 1 = -7/4 = -1,75
(7x⁶+7)/8x³ = 7(x⁶+1)/8x³ =7/8 · (x⁶+1)/x³ = 7/8 · (x³+1/x³) = 7/8 · (x +1/x)(x² - 1 + 1/x²) =
= 7/8 · (x +1/x)(x² + 2 + 1/x² - 3) = 7/8 · (x +1/x)((x + 1/x)² - 3) = 7/8 · (-2)((-2)² - 3) =
= 7/8 · (-2)(4 - 3) = 7/8 · (-2) · 1 = -7/4 = -1,75