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Simplifying 7x2 + 12x + 15 = 0 Reorder the terms: 15 + 12x + 7x2 = 0 Solving 15 + 12x + 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'. 2.142857143 + 1.714285714x + x2 = 0 Move the constant term to the right: Add '-2.142857143' to each side of the equation. 2.142857143 + 1.714285714x + -2.142857143 + x2 = 0 + -2.142857143 Reorder the terms: 2.142857143 + -2.142857143 + 1.714285714x + x2 = 0 + -2.142857143 Combine like terms: 2.142857143 + -2.142857143 = 0.000000000 0.000000000 + 1.714285714x + x2 = 0 + -2.142857143 1.714285714x + x2 = 0 + -2.142857143 Combine like terms: 0 + -2.142857143 = -2.142857143 1.714285714x + x2 = -2.142857143 The x term is 1.714285714x. Take half its coefficient (0.857142857). Square it (0.7346938773) and add it to both sides. Add '0.7346938773' to each side of the equation. 1.714285714x + 0.7346938773 + x2 = -2.142857143 + 0.7346938773 Reorder the terms: 0.7346938773 + 1.714285714x + x2 = -2.142857143 + 0.7346938773 Combine like terms: -2.142857143 + 0.7346938773 = -1.4081632657 0.7346938773 + 1.714285714x + x2 = -1.4081632657 Factor a perfect square on the left side: (x + 0.857142857)(x + 0.857142857) = -1.4081632657 Can't calculate square root of the right side. The solution to this equation could not be determined.
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