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Simplifying 21y2 + -15y + 5 = 0 Reorder the terms: 5 + -15y + 21y2 = 0 Solving 5 + -15y + 21y2 = 0 Solving for variable 'y'. Begin completing the square. Divide all terms by 21 the coefficient of the squared term: Divide each side by '21'. 0.2380952381 + -0.7142857143y + y2 = 0 Move the constant term to the right: Add '-0.2380952381' to each side of the equation. 0.2380952381 + -0.7142857143y + -0.2380952381 + y2 = 0 + -0.2380952381 Reorder the terms: 0.2380952381 + -0.2380952381 + -0.7142857143y + y2 = 0 + -0.2380952381 Combine like terms: 0.2380952381 + -0.2380952381 = 0.0000000000 0.0000000000 + -0.7142857143y + y2 = 0 + -0.2380952381 -0.7142857143y + y2 = 0 + -0.2380952381 Combine like terms: 0 + -0.2380952381 = -0.2380952381 -0.7142857143y + y2 = -0.2380952381 The y term is -0.7142857143y. Take half its coefficient (-0.3571428572). Square it (0.1275510204) and add it to both sides. Add '0.1275510204' to each side of the equation. -0.7142857143y + 0.1275510204 + y2 = -0.2380952381 + 0.1275510204 Reorder the terms: 0.1275510204 + -0.7142857143y + y2 = -0.2380952381 + 0.1275510204 Combine like terms: -0.2380952381 + 0.1275510204 = -0.1105442177 0.1275510204 + -0.7142857143y + y2 = -0.1105442177 Factor a perfect square on the left side: (y + -0.3571428572)(y + -0.3571428572) = -0.1105442177 Can't calculate square root of the right side. The solution to this equation could not be determined.
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