9x^2=4-2x

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


Simplifying
9x2 = 4 + -2x

Solving
9x2 = 4 + -2x

Solving for variable 'x'.

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

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

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

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

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

Divide each side by '9'.
-0.4444444444 + 0.2222222222x + x2 = 0

Move the constant term to the right:

Add '0.4444444444' to each side of the equation.
-0.4444444444 + 0.2222222222x + 0.4444444444 + x2 = 0 + 0.4444444444

Reorder the terms:
-0.4444444444 + 0.4444444444 + 0.2222222222x + x2 = 0 + 0.4444444444

Combine like terms: -0.4444444444 + 0.4444444444 = 0.0000000000
0.0000000000 + 0.2222222222x + x2 = 0 + 0.4444444444
0.2222222222x + x2 = 0 + 0.4444444444

Combine like terms: 0 + 0.4444444444 = 0.4444444444
0.2222222222x + x2 = 0.4444444444

The x term is 0.2222222222x.  Take half its coefficient (0.1111111111).
Square it (0.01234567901) and add it to both sides.

Add '0.01234567901' to each side of the equation.
0.2222222222x + 0.01234567901 + x2 = 0.4444444444 + 0.01234567901

Reorder the terms:
0.01234567901 + 0.2222222222x + x2 = 0.4444444444 + 0.01234567901

Combine like terms: 0.4444444444 + 0.01234567901 = 0.45679012341
0.01234567901 + 0.2222222222x + x2 = 0.45679012341

Factor a perfect square on the left side:
(x + 0.1111111111)(x + 0.1111111111) = 0.45679012341

Calculate the square root of the right side: 0.675862503

Break this problem into two subproblems by setting 
(x + 0.1111111111) equal to 0.675862503 and -0.675862503.

Subproblem 1

x + 0.1111111111 = 0.675862503 Simplifying x + 0.1111111111 = 0.675862503 Reorder the terms: 0.1111111111 + x = 0.675862503 Solving 0.1111111111 + x = 0.675862503 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1111111111' to each side of the equation. 0.1111111111 + -0.1111111111 + x = 0.675862503 + -0.1111111111 Combine like terms: 0.1111111111 + -0.1111111111 = 0.0000000000 0.0000000000 + x = 0.675862503 + -0.1111111111 x = 0.675862503 + -0.1111111111 Combine like terms: 0.675862503 + -0.1111111111 = 0.5647513919 x = 0.5647513919 Simplifying x = 0.5647513919

Subproblem 2

x + 0.1111111111 = -0.675862503 Simplifying x + 0.1111111111 = -0.675862503 Reorder the terms: 0.1111111111 + x = -0.675862503 Solving 0.1111111111 + x = -0.675862503 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1111111111' to each side of the equation. 0.1111111111 + -0.1111111111 + x = -0.675862503 + -0.1111111111 Combine like terms: 0.1111111111 + -0.1111111111 = 0.0000000000 0.0000000000 + x = -0.675862503 + -0.1111111111 x = -0.675862503 + -0.1111111111 Combine like terms: -0.675862503 + -0.1111111111 = -0.7869736141 x = -0.7869736141 Simplifying x = -0.7869736141

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5647513919, -0.7869736141}

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