x=-4x^2+5x+1

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Solution for x=-4x^2+5x+1 equation:


Simplifying
x = -4x2 + 5x + 1

Reorder the terms:
x = 1 + 5x + -4x2

Solving
x = 1 + 5x + -4x2

Solving for variable 'x'.

Reorder the terms:
-1 + x + -5x + 4x2 = 1 + 5x + -4x2 + -1 + -5x + 4x2

Combine like terms: x + -5x = -4x
-1 + -4x + 4x2 = 1 + 5x + -4x2 + -1 + -5x + 4x2

Reorder the terms:
-1 + -4x + 4x2 = 1 + -1 + 5x + -5x + -4x2 + 4x2

Combine like terms: 1 + -1 = 0
-1 + -4x + 4x2 = 0 + 5x + -5x + -4x2 + 4x2
-1 + -4x + 4x2 = 5x + -5x + -4x2 + 4x2

Combine like terms: 5x + -5x = 0
-1 + -4x + 4x2 = 0 + -4x2 + 4x2
-1 + -4x + 4x2 = -4x2 + 4x2

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

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

Divide each side by '4'.
-0.25 + -1x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -1x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -1x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -1x + x2 = 0 + 0.25
-1x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-1x + x2 = 0.25

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 0.25 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 0.25 + 0.25

Combine like terms: 0.25 + 0.25 = 0.5
0.25 + -1x + x2 = 0.5

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 0.5

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(x + -0.5) equal to 0.707106781 and -0.707106781.

Subproblem 1

x + -0.5 = 0.707106781 Simplifying x + -0.5 = 0.707106781 Reorder the terms: -0.5 + x = 0.707106781 Solving -0.5 + x = 0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 0.707106781 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 0.707106781 + 0.5 x = 0.707106781 + 0.5 Combine like terms: 0.707106781 + 0.5 = 1.207106781 x = 1.207106781 Simplifying x = 1.207106781

Subproblem 2

x + -0.5 = -0.707106781 Simplifying x + -0.5 = -0.707106781 Reorder the terms: -0.5 + x = -0.707106781 Solving -0.5 + x = -0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -0.707106781 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -0.707106781 + 0.5 x = -0.707106781 + 0.5 Combine like terms: -0.707106781 + 0.5 = -0.207106781 x = -0.207106781 Simplifying x = -0.207106781

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.207106781, -0.207106781}

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