4x^2-x=43

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Solution for 4x^2-x=43 equation:


Simplifying
4x2 + -1x = 43

Reorder the terms:
-1x + 4x2 = 43

Solving
-1x + 4x2 = 43

Solving for variable 'x'.

Reorder the terms:
-43 + -1x + 4x2 = 43 + -43

Combine like terms: 43 + -43 = 0
-43 + -1x + 4x2 = 0

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

Divide each side by '4'.
-10.75 + -0.25x + x2 = 0

Move the constant term to the right:

Add '10.75' to each side of the equation.
-10.75 + -0.25x + 10.75 + x2 = 0 + 10.75

Reorder the terms:
-10.75 + 10.75 + -0.25x + x2 = 0 + 10.75

Combine like terms: -10.75 + 10.75 = 0.00
0.00 + -0.25x + x2 = 0 + 10.75
-0.25x + x2 = 0 + 10.75

Combine like terms: 0 + 10.75 = 10.75
-0.25x + x2 = 10.75

The x term is -0.25x.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25x + 0.015625 + x2 = 10.75 + 0.015625

Reorder the terms:
0.015625 + -0.25x + x2 = 10.75 + 0.015625

Combine like terms: 10.75 + 0.015625 = 10.765625
0.015625 + -0.25x + x2 = 10.765625

Factor a perfect square on the left side:
(x + -0.125)(x + -0.125) = 10.765625

Calculate the square root of the right side: 3.281101187

Break this problem into two subproblems by setting 
(x + -0.125) equal to 3.281101187 and -3.281101187.

Subproblem 1

x + -0.125 = 3.281101187 Simplifying x + -0.125 = 3.281101187 Reorder the terms: -0.125 + x = 3.281101187 Solving -0.125 + x = 3.281101187 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = 3.281101187 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = 3.281101187 + 0.125 x = 3.281101187 + 0.125 Combine like terms: 3.281101187 + 0.125 = 3.406101187 x = 3.406101187 Simplifying x = 3.406101187

Subproblem 2

x + -0.125 = -3.281101187 Simplifying x + -0.125 = -3.281101187 Reorder the terms: -0.125 + x = -3.281101187 Solving -0.125 + x = -3.281101187 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = -3.281101187 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = -3.281101187 + 0.125 x = -3.281101187 + 0.125 Combine like terms: -3.281101187 + 0.125 = -3.156101187 x = -3.156101187 Simplifying x = -3.156101187

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.406101187, -3.156101187}

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