4x^2+27x=18

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Solution for 4x^2+27x=18 equation:


Simplifying
4x2 + 27x = 18

Reorder the terms:
27x + 4x2 = 18

Solving
27x + 4x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + 27x + 4x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 27x + 4x2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-4.5 + 6.75x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 6.75x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 6.75x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 6.75x + x2 = 0 + 4.5
6.75x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
6.75x + x2 = 4.5

The x term is 6.75x.  Take half its coefficient (3.375).
Square it (11.390625) and add it to both sides.

Add '11.390625' to each side of the equation.
6.75x + 11.390625 + x2 = 4.5 + 11.390625

Reorder the terms:
11.390625 + 6.75x + x2 = 4.5 + 11.390625

Combine like terms: 4.5 + 11.390625 = 15.890625
11.390625 + 6.75x + x2 = 15.890625

Factor a perfect square on the left side:
(x + 3.375)(x + 3.375) = 15.890625

Calculate the square root of the right side: 3.98630468

Break this problem into two subproblems by setting 
(x + 3.375) equal to 3.98630468 and -3.98630468.

Subproblem 1

x + 3.375 = 3.98630468 Simplifying x + 3.375 = 3.98630468 Reorder the terms: 3.375 + x = 3.98630468 Solving 3.375 + x = 3.98630468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.375' to each side of the equation. 3.375 + -3.375 + x = 3.98630468 + -3.375 Combine like terms: 3.375 + -3.375 = 0.000 0.000 + x = 3.98630468 + -3.375 x = 3.98630468 + -3.375 Combine like terms: 3.98630468 + -3.375 = 0.61130468 x = 0.61130468 Simplifying x = 0.61130468

Subproblem 2

x + 3.375 = -3.98630468 Simplifying x + 3.375 = -3.98630468 Reorder the terms: 3.375 + x = -3.98630468 Solving 3.375 + x = -3.98630468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.375' to each side of the equation. 3.375 + -3.375 + x = -3.98630468 + -3.375 Combine like terms: 3.375 + -3.375 = 0.000 0.000 + x = -3.98630468 + -3.375 x = -3.98630468 + -3.375 Combine like terms: -3.98630468 + -3.375 = -7.36130468 x = -7.36130468 Simplifying x = -7.36130468

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.61130468, -7.36130468}

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