-5x^2-9x-8=0

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Solution for -5x^2-9x-8=0 equation:


Simplifying
-5x2 + -9x + -8 = 0

Reorder the terms:
-8 + -9x + -5x2 = 0

Solving
-8 + -9x + -5x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(8 + 9x + 5x2) = 0

Ignore the factor -1.

Subproblem 1

Set the factor '(8 + 9x + 5x2)' equal to zero and attempt to solve: Simplifying 8 + 9x + 5x2 = 0 Solving 8 + 9x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 1.6 + 1.8x + x2 = 0 Move the constant term to the right: Add '-1.6' to each side of the equation. 1.6 + 1.8x + -1.6 + x2 = 0 + -1.6 Reorder the terms: 1.6 + -1.6 + 1.8x + x2 = 0 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + 1.8x + x2 = 0 + -1.6 1.8x + x2 = 0 + -1.6 Combine like terms: 0 + -1.6 = -1.6 1.8x + x2 = -1.6 The x term is 1.8x. Take half its coefficient (0.9). Square it (0.81) and add it to both sides. Add '0.81' to each side of the equation. 1.8x + 0.81 + x2 = -1.6 + 0.81 Reorder the terms: 0.81 + 1.8x + x2 = -1.6 + 0.81 Combine like terms: -1.6 + 0.81 = -0.79 0.81 + 1.8x + x2 = -0.79 Factor a perfect square on the left side: (x + 0.9)(x + 0.9) = -0.79 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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