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What statement is true? 2x^2-9x+2=-1

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Two triangles can be formed with the given information. use the law of sines to solve the triangles. b = 49°, a = 16, b = 14