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Simplifying 15x2 + 21x + 15 = 0 Reorder the terms: 15 + 21x + 15x2 = 0 Solving 15 + 21x + 15x2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '3'. 3(5 + 7x + 5x2) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(5 + 7x + 5x2)' equal to zero and attempt to solve: Simplifying 5 + 7x + 5x2 = 0 Solving 5 + 7x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 1 + 1.4x + x2 = 0 Move the constant term to the right: Add '-1' to each side of the equation. 1 + 1.4x + -1 + x2 = 0 + -1 Reorder the terms: 1 + -1 + 1.4x + x2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 1.4x + x2 = 0 + -1 1.4x + x2 = 0 + -1 Combine like terms: 0 + -1 = -1 1.4x + x2 = -1 The x term is 1.4x. Take half its coefficient (0.7). Square it (0.49) and add it to both sides. Add '0.49' to each side of the equation. 1.4x + 0.49 + x2 = -1 + 0.49 Reorder the terms: 0.49 + 1.4x + x2 = -1 + 0.49 Combine like terms: -1 + 0.49 = -0.51 0.49 + 1.4x + x2 = -0.51 Factor a perfect square on the left side: (x + 0.7)(x + 0.7) = -0.51 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.
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