Approximation - Weight function

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Hi could anyone help with this task (point C):

https://zapodaj.net/a079f713ac6c0.png.html

As far I've got: $$Q(θ) = ∫_0^1(u^2−au_n)^2*(−2u+2)du$$

What next? Derivative by $$u$$ of this calculus function and then equate it to zero?