Let's rewrite the equation as:
y = -8x⁻¹ + 5x⁻²
y' = -(1)*-8x⁻² + (-2)*(5)x⁻³
y' = 8/x² - 10/x³
Now, let's evalute y' for x = 2:
y'(2) = 8/(2)² - 10/(2)³ = 8/4 - 10/8 = 2 - 5/4 = 3/4
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