(18x-9)(4x+13)=180

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Solution for (18x-9)(4x+13)=180 equation:


Simplifying
(18x + -9)(4x + 13) = 180

Reorder the terms:
(-9 + 18x)(4x + 13) = 180

Reorder the terms:
(-9 + 18x)(13 + 4x) = 180

Multiply (-9 + 18x) * (13 + 4x)
(-9(13 + 4x) + 18x * (13 + 4x)) = 180
((13 * -9 + 4x * -9) + 18x * (13 + 4x)) = 180
((-117 + -36x) + 18x * (13 + 4x)) = 180
(-117 + -36x + (13 * 18x + 4x * 18x)) = 180
(-117 + -36x + (234x + 72x2)) = 180

Combine like terms: -36x + 234x = 198x
(-117 + 198x + 72x2) = 180

Solving
-117 + 198x + 72x2 = 180

Solving for variable 'x'.

Reorder the terms:
-117 + -180 + 198x + 72x2 = 180 + -180

Combine like terms: -117 + -180 = -297
-297 + 198x + 72x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-297 + 198x + 72x2 = 0

Factor out the Greatest Common Factor (GCF), '9'.
9(-33 + 22x + 8x2) = 0

Ignore the factor 9.

Subproblem 1

Set the factor '(-33 + 22x + 8x2)' equal to zero and attempt to solve: Simplifying -33 + 22x + 8x2 = 0 Solving -33 + 22x + 8x2 = 0 Begin completing the square. Divide all terms by 8 the coefficient of the squared term: Divide each side by '8'. -4.125 + 2.75x + x2 = 0 Move the constant term to the right: Add '4.125' to each side of the equation. -4.125 + 2.75x + 4.125 + x2 = 0 + 4.125 Reorder the terms: -4.125 + 4.125 + 2.75x + x2 = 0 + 4.125 Combine like terms: -4.125 + 4.125 = 0.000 0.000 + 2.75x + x2 = 0 + 4.125 2.75x + x2 = 0 + 4.125 Combine like terms: 0 + 4.125 = 4.125 2.75x + x2 = 4.125 The x term is 2.75x. Take half its coefficient (1.375). Square it (1.890625) and add it to both sides. Add '1.890625' to each side of the equation. 2.75x + 1.890625 + x2 = 4.125 + 1.890625 Reorder the terms: 1.890625 + 2.75x + x2 = 4.125 + 1.890625 Combine like terms: 4.125 + 1.890625 = 6.015625 1.890625 + 2.75x + x2 = 6.015625 Factor a perfect square on the left side: (x + 1.375)(x + 1.375) = 6.015625 Calculate the square root of the right side: 2.452677109 Break this problem into two subproblems by setting (x + 1.375) equal to 2.452677109 and -2.452677109.

Subproblem 1

x + 1.375 = 2.452677109 Simplifying x + 1.375 = 2.452677109 Reorder the terms: 1.375 + x = 2.452677109 Solving 1.375 + x = 2.452677109 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = 2.452677109 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = 2.452677109 + -1.375 x = 2.452677109 + -1.375 Combine like terms: 2.452677109 + -1.375 = 1.077677109 x = 1.077677109 Simplifying x = 1.077677109

Subproblem 2

x + 1.375 = -2.452677109 Simplifying x + 1.375 = -2.452677109 Reorder the terms: 1.375 + x = -2.452677109 Solving 1.375 + x = -2.452677109 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = -2.452677109 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = -2.452677109 + -1.375 x = -2.452677109 + -1.375 Combine like terms: -2.452677109 + -1.375 = -3.827677109 x = -3.827677109 Simplifying x = -3.827677109

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.077677109, -3.827677109}

Solution

x = {1.077677109, -3.827677109}

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