Use Gram-Schmidt to find an orthonormal basis of a product of two polynomials.

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Given $n = 4, x_1 = 1, x_2 = 0, x_3 = 2, x_4 = 3, and B = span\{1, t, t^2\}$, find an orthonormal basis of B under the scalar product

$\sum_{i=1} ^{n} p(x_i)q(x_i)$

using Gram Schmidt.

I am very new to this and a bit confused.