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Hello, I was wondering if Sagemath can be used to optimize a quadratic function

y = b_0 + b_1x_1 + b_11x_1^2 + b_2x_2 + b_22x_2^2 + ... + b_kx_k + b_kkx_kk^2

subject to boundary constraints

1 <= x_i <= 9, i = 1, ..., k

Thanks, T.S. Lim