The line x + y - 1 = 0 intersects the circle x^2 + y^2 = 13 at A(x1,y1) and B(x2, y2). Without finding the coordinates of A and B, find the length of the chord AB.

HINT: form a quadratic equation in x and evaluate l x1 - x2 l and l y1 - y2 l

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how do i got about doing this question