8x^2-27x+4=0

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Solution for 8x^2-27x+4=0 equation:


Simplifying
8x2 + -27x + 4 = 0

Reorder the terms:
4 + -27x + 8x2 = 0

Solving
4 + -27x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
0.5 + -3.375x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -3.375x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -3.375x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -3.375x + x2 = 0 + -0.5
-3.375x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-3.375x + x2 = -0.5

The x term is -3.375x.  Take half its coefficient (-1.6875).
Square it (2.84765625) and add it to both sides.

Add '2.84765625' to each side of the equation.
-3.375x + 2.84765625 + x2 = -0.5 + 2.84765625

Reorder the terms:
2.84765625 + -3.375x + x2 = -0.5 + 2.84765625

Combine like terms: -0.5 + 2.84765625 = 2.34765625
2.84765625 + -3.375x + x2 = 2.34765625

Factor a perfect square on the left side:
(x + -1.6875)(x + -1.6875) = 2.34765625

Calculate the square root of the right side: 1.532206334

Break this problem into two subproblems by setting 
(x + -1.6875) equal to 1.532206334 and -1.532206334.

Subproblem 1

x + -1.6875 = 1.532206334 Simplifying x + -1.6875 = 1.532206334 Reorder the terms: -1.6875 + x = 1.532206334 Solving -1.6875 + x = 1.532206334 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6875' to each side of the equation. -1.6875 + 1.6875 + x = 1.532206334 + 1.6875 Combine like terms: -1.6875 + 1.6875 = 0.0000 0.0000 + x = 1.532206334 + 1.6875 x = 1.532206334 + 1.6875 Combine like terms: 1.532206334 + 1.6875 = 3.219706334 x = 3.219706334 Simplifying x = 3.219706334

Subproblem 2

x + -1.6875 = -1.532206334 Simplifying x + -1.6875 = -1.532206334 Reorder the terms: -1.6875 + x = -1.532206334 Solving -1.6875 + x = -1.532206334 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6875' to each side of the equation. -1.6875 + 1.6875 + x = -1.532206334 + 1.6875 Combine like terms: -1.6875 + 1.6875 = 0.0000 0.0000 + x = -1.532206334 + 1.6875 x = -1.532206334 + 1.6875 Combine like terms: -1.532206334 + 1.6875 = 0.155293666 x = 0.155293666 Simplifying x = 0.155293666

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.219706334, 0.155293666}

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