4x^2-27x=12

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Solution for 4x^2-27x=12 equation:


Simplifying
4x2 + -27x = 12

Reorder the terms:
-27x + 4x2 = 12

Solving
-27x + 4x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + -27x + 4x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + -27x + 4x2 = 0

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

Divide each side by '4'.
-3 + -6.75x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -6.75x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -6.75x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -6.75x + x2 = 0 + 3
-6.75x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-6.75x + x2 = 3

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 = 3 + 11.390625

Reorder the terms:
11.390625 + -6.75x + x2 = 3 + 11.390625

Combine like terms: 3 + 11.390625 = 14.390625
11.390625 + -6.75x + x2 = 14.390625

Factor a perfect square on the left side:
(x + -3.375)(x + -3.375) = 14.390625

Calculate the square root of the right side: 3.793497726

Break this problem into two subproblems by setting 
(x + -3.375) equal to 3.793497726 and -3.793497726.

Subproblem 1

x + -3.375 = 3.793497726 Simplifying x + -3.375 = 3.793497726 Reorder the terms: -3.375 + x = 3.793497726 Solving -3.375 + x = 3.793497726 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 = 3.793497726 + 3.375 Combine like terms: -3.375 + 3.375 = 0.000 0.000 + x = 3.793497726 + 3.375 x = 3.793497726 + 3.375 Combine like terms: 3.793497726 + 3.375 = 7.168497726 x = 7.168497726 Simplifying x = 7.168497726

Subproblem 2

x + -3.375 = -3.793497726 Simplifying x + -3.375 = -3.793497726 Reorder the terms: -3.375 + x = -3.793497726 Solving -3.375 + x = -3.793497726 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 = -3.793497726 + 3.375 Combine like terms: -3.375 + 3.375 = 0.000 0.000 + x = -3.793497726 + 3.375 x = -3.793497726 + 3.375 Combine like terms: -3.793497726 + 3.375 = -0.418497726 x = -0.418497726 Simplifying x = -0.418497726

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.168497726, -0.418497726}

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