4x^2+1=9x-2

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Solution for 4x^2+1=9x-2 equation:


Simplifying
4x2 + 1 = 9x + -2

Reorder the terms:
1 + 4x2 = 9x + -2

Reorder the terms:
1 + 4x2 = -2 + 9x

Solving
1 + 4x2 = -2 + 9x

Solving for variable 'x'.

Reorder the terms:
1 + 2 + -9x + 4x2 = -2 + 9x + 2 + -9x

Combine like terms: 1 + 2 = 3
3 + -9x + 4x2 = -2 + 9x + 2 + -9x

Reorder the terms:
3 + -9x + 4x2 = -2 + 2 + 9x + -9x

Combine like terms: -2 + 2 = 0
3 + -9x + 4x2 = 0 + 9x + -9x
3 + -9x + 4x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
3 + -9x + 4x2 = 0

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

Divide each side by '4'.
0.75 + -2.25x + x2 = 0

Move the constant term to the right:

Add '-0.75' to each side of the equation.
0.75 + -2.25x + -0.75 + x2 = 0 + -0.75

Reorder the terms:
0.75 + -0.75 + -2.25x + x2 = 0 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
0.00 + -2.25x + x2 = 0 + -0.75
-2.25x + x2 = 0 + -0.75

Combine like terms: 0 + -0.75 = -0.75
-2.25x + x2 = -0.75

The x term is -2.25x.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25x + 1.265625 + x2 = -0.75 + 1.265625

Reorder the terms:
1.265625 + -2.25x + x2 = -0.75 + 1.265625

Combine like terms: -0.75 + 1.265625 = 0.515625
1.265625 + -2.25x + x2 = 0.515625

Factor a perfect square on the left side:
(x + -1.125)(x + -1.125) = 0.515625

Calculate the square root of the right side: 0.718070331

Break this problem into two subproblems by setting 
(x + -1.125) equal to 0.718070331 and -0.718070331.

Subproblem 1

x + -1.125 = 0.718070331 Simplifying x + -1.125 = 0.718070331 Reorder the terms: -1.125 + x = 0.718070331 Solving -1.125 + x = 0.718070331 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = 0.718070331 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = 0.718070331 + 1.125 x = 0.718070331 + 1.125 Combine like terms: 0.718070331 + 1.125 = 1.843070331 x = 1.843070331 Simplifying x = 1.843070331

Subproblem 2

x + -1.125 = -0.718070331 Simplifying x + -1.125 = -0.718070331 Reorder the terms: -1.125 + x = -0.718070331 Solving -1.125 + x = -0.718070331 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = -0.718070331 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = -0.718070331 + 1.125 x = -0.718070331 + 1.125 Combine like terms: -0.718070331 + 1.125 = 0.406929669 x = 0.406929669 Simplifying x = 0.406929669

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.843070331, 0.406929669}

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