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Simplifying 15x2 + -79x + 128 = 0 Reorder the terms: 128 + -79x + 15x2 = 0 Solving 128 + -79x + 15x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 15 the coefficient of the squared term: Divide each side by '15'. 8.533333333 + -5.266666667x + x2 = 0 Move the constant term to the right: Add '-8.533333333' to each side of the equation. 8.533333333 + -5.266666667x + -8.533333333 + x2 = 0 + -8.533333333 Reorder the terms: 8.533333333 + -8.533333333 + -5.266666667x + x2 = 0 + -8.533333333 Combine like terms: 8.533333333 + -8.533333333 = 0.000000000 0.000000000 + -5.266666667x + x2 = 0 + -8.533333333 -5.266666667x + x2 = 0 + -8.533333333 Combine like terms: 0 + -8.533333333 = -8.533333333 -5.266666667x + x2 = -8.533333333 The x term is -5.266666667x. Take half its coefficient (-2.633333334). Square it (6.934444448) and add it to both sides. Add '6.934444448' to each side of the equation. -5.266666667x + 6.934444448 + x2 = -8.533333333 + 6.934444448 Reorder the terms: 6.934444448 + -5.266666667x + x2 = -8.533333333 + 6.934444448 Combine like terms: -8.533333333 + 6.934444448 = -1.598888885 6.934444448 + -5.266666667x + x2 = -1.598888885 Factor a perfect square on the left side: (x + -2.633333334)(x + -2.633333334) = -1.598888885 Can't calculate square root of the right side. The solution to this equation could not be determined.
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