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Find the equation of the line that passes through the point -2, 12 and -5, 21? How does one "algebra"?? What is vertex form of the quadratic equation by completing the square y=-3x^2-12x+9? What is the potential difference between xi = 2.0 m and xf = 3.0 m ? Two particles have charges of q1 and q2, where q1 = +4.8C. Parted by 0.35 m, and particle 1 has a force of 4.0 N. Value of q2, its sign?