x=4x^2-5.25x+2

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Solution for x=4x^2-5.25x+2 equation:


Simplifying
x = 4x2 + -5.25x + 2

Reorder the terms:
x = 2 + -5.25x + 4x2

Solving
x = 2 + -5.25x + 4x2

Solving for variable 'x'.

Reorder the terms:
-2 + x + 5.25x + -4x2 = 2 + -5.25x + 4x2 + -2 + 5.25x + -4x2

Combine like terms: x + 5.25x = 6.25x
-2 + 6.25x + -4x2 = 2 + -5.25x + 4x2 + -2 + 5.25x + -4x2

Reorder the terms:
-2 + 6.25x + -4x2 = 2 + -2 + -5.25x + 5.25x + 4x2 + -4x2

Combine like terms: 2 + -2 = 0
-2 + 6.25x + -4x2 = 0 + -5.25x + 5.25x + 4x2 + -4x2
-2 + 6.25x + -4x2 = -5.25x + 5.25x + 4x2 + -4x2

Combine like terms: -5.25x + 5.25x = 0.00
-2 + 6.25x + -4x2 = 0.00 + 4x2 + -4x2
-2 + 6.25x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
-2 + 6.25x + -4x2 = 0

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

Divide each side by '-4'.
0.5 + -1.5625x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -1.5625x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -1.5625x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -1.5625x + x2 = 0 + -0.5
-1.5625x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-1.5625x + x2 = -0.5

The x term is -1.5625x.  Take half its coefficient (-0.78125).
Square it (0.6103515625) and add it to both sides.

Add '0.6103515625' to each side of the equation.
-1.5625x + 0.6103515625 + x2 = -0.5 + 0.6103515625

Reorder the terms:
0.6103515625 + -1.5625x + x2 = -0.5 + 0.6103515625

Combine like terms: -0.5 + 0.6103515625 = 0.1103515625
0.6103515625 + -1.5625x + x2 = 0.1103515625

Factor a perfect square on the left side:
(x + -0.78125)(x + -0.78125) = 0.1103515625

Calculate the square root of the right side: 0.332192057

Break this problem into two subproblems by setting 
(x + -0.78125) equal to 0.332192057 and -0.332192057.

Subproblem 1

x + -0.78125 = 0.332192057 Simplifying x + -0.78125 = 0.332192057 Reorder the terms: -0.78125 + x = 0.332192057 Solving -0.78125 + x = 0.332192057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.78125' to each side of the equation. -0.78125 + 0.78125 + x = 0.332192057 + 0.78125 Combine like terms: -0.78125 + 0.78125 = 0.00000 0.00000 + x = 0.332192057 + 0.78125 x = 0.332192057 + 0.78125 Combine like terms: 0.332192057 + 0.78125 = 1.113442057 x = 1.113442057 Simplifying x = 1.113442057

Subproblem 2

x + -0.78125 = -0.332192057 Simplifying x + -0.78125 = -0.332192057 Reorder the terms: -0.78125 + x = -0.332192057 Solving -0.78125 + x = -0.332192057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.78125' to each side of the equation. -0.78125 + 0.78125 + x = -0.332192057 + 0.78125 Combine like terms: -0.78125 + 0.78125 = 0.00000 0.00000 + x = -0.332192057 + 0.78125 x = -0.332192057 + 0.78125 Combine like terms: -0.332192057 + 0.78125 = 0.449057943 x = 0.449057943 Simplifying x = 0.449057943

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.113442057, 0.449057943}

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