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That is NOT a "system of equations". That is an equation. There is no solution to that, but it is a line with a y-intercept of -2, and a slope of -3.
3x2-4x-15 = 0 (3x+5)(x-3) = 0 x = -5/3 or x = 3
Yes. (Assuming that -3x2 is the best representation of 3x2 that this browser will allow.)
3x2 - 10x - 8 = (3x + 2) (x - 4)
3x2 - 19x - 14 = 0 3x2 - 21x + 2x - 14 = 0 3x(x - 7) + 2(x - 7) = 0 (x - 7)(3x + 2) = 0 x - 7 = 0 or 3x + 2 = 0 x = 7 or x = -2/3
3x2+x-4 = 0 (3x+4)(x-1) = 0 Solutions: x = 1 and x = -4/3 By using the quadratic equation formula.