21x^2-15x-24=-27

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Solution for 21x^2-15x-24=-27 equation:


Simplifying
21x2 + -15x + -24 = -27

Reorder the terms:
-24 + -15x + 21x2 = -27

Solving
-24 + -15x + 21x2 = -27

Solving for variable 'x'.

Reorder the terms:
-24 + 27 + -15x + 21x2 = -27 + 27

Combine like terms: -24 + 27 = 3
3 + -15x + 21x2 = -27 + 27

Combine like terms: -27 + 27 = 0
3 + -15x + 21x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(1 + -5x + 7x2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(1 + -5x + 7x2)' equal to zero and attempt to solve: Simplifying 1 + -5x + 7x2 = 0 Solving 1 + -5x + 7x2 = 0 Begin completing the square. Divide all terms by 7 the coefficient of the squared term: Divide each side by '7'. 0.1428571429 + -0.7142857143x + x2 = 0 Move the constant term to the right: Add '-0.1428571429' to each side of the equation. 0.1428571429 + -0.7142857143x + -0.1428571429 + x2 = 0 + -0.1428571429 Reorder the terms: 0.1428571429 + -0.1428571429 + -0.7142857143x + x2 = 0 + -0.1428571429 Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000 0.0000000000 + -0.7142857143x + x2 = 0 + -0.1428571429 -0.7142857143x + x2 = 0 + -0.1428571429 Combine like terms: 0 + -0.1428571429 = -0.1428571429 -0.7142857143x + x2 = -0.1428571429 The x term is -0.7142857143x. 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. -0.7142857143x + 0.1275510204 + x2 = -0.1428571429 + 0.1275510204 Reorder the terms: 0.1275510204 + -0.7142857143x + x2 = -0.1428571429 + 0.1275510204 Combine like terms: -0.1428571429 + 0.1275510204 = -0.0153061225 0.1275510204 + -0.7142857143x + x2 = -0.0153061225 Factor a perfect square on the left side: (x + -0.3571428572)(x + -0.3571428572) = -0.0153061225 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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