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Simplifying 15x + -7x2 + -16 = 0 Reorder the terms: -16 + 15x + -7x2 = 0 Solving -16 + 15x + -7x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -7 the coefficient of the squared term: Divide each side by '-7'. 2.285714286 + -2.142857143x + x2 = 0 Move the constant term to the right: Add '-2.285714286' to each side of the equation. 2.285714286 + -2.142857143x + -2.285714286 + x2 = 0 + -2.285714286 Reorder the terms: 2.285714286 + -2.285714286 + -2.142857143x + x2 = 0 + -2.285714286 Combine like terms: 2.285714286 + -2.285714286 = 0.000000000 0.000000000 + -2.142857143x + x2 = 0 + -2.285714286 -2.142857143x + x2 = 0 + -2.285714286 Combine like terms: 0 + -2.285714286 = -2.285714286 -2.142857143x + x2 = -2.285714286 The x term is -2.142857143x. Take half its coefficient (-1.071428572). Square it (1.147959185) and add it to both sides. Add '1.147959185' to each side of the equation. -2.142857143x + 1.147959185 + x2 = -2.285714286 + 1.147959185 Reorder the terms: 1.147959185 + -2.142857143x + x2 = -2.285714286 + 1.147959185 Combine like terms: -2.285714286 + 1.147959185 = -1.137755101 1.147959185 + -2.142857143x + x2 = -1.137755101 Factor a perfect square on the left side: (x + -1.071428572)(x + -1.071428572) = -1.137755101 Can't calculate square root of the right side. The solution to this equation could not be determined.
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