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How do you use Gaussian Elimination to work this one out? Solve a system of linear...

How do you use Gaussian Elimination to work this one out? Solve a system of linear equations to find the quadratic polynomial y = ax^2 + bx + c whose graph passes through the three points (x1, y1) = (1, 4), (x2, y2) = (2, 2) and (x3, y3) = (3, −2).

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