12=18-4x-5x^2

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Solution for 12=18-4x-5x^2 equation:


Simplifying
12 = 18 + -4x + -5x2

Solving
12 = 18 + -4x + -5x2

Solving for variable 'x'.

Combine like terms: 12 + -18 = -6
-6 + 4x + 5x2 = 18 + -4x + -5x2 + -18 + 4x + 5x2

Reorder the terms:
-6 + 4x + 5x2 = 18 + -18 + -4x + 4x + -5x2 + 5x2

Combine like terms: 18 + -18 = 0
-6 + 4x + 5x2 = 0 + -4x + 4x + -5x2 + 5x2
-6 + 4x + 5x2 = -4x + 4x + -5x2 + 5x2

Combine like terms: -4x + 4x = 0
-6 + 4x + 5x2 = 0 + -5x2 + 5x2
-6 + 4x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
-6 + 4x + 5x2 = 0

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

Divide each side by '5'.
-1.2 + 0.8x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + 0.8x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + 0.8x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + 0.8x + x2 = 0 + 1.2
0.8x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
0.8x + x2 = 1.2

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 1.2 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 1.2 + 0.16

Combine like terms: 1.2 + 0.16 = 1.36
0.16 + 0.8x + x2 = 1.36

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 1.36

Calculate the square root of the right side: 1.166190379

Break this problem into two subproblems by setting 
(x + 0.4) equal to 1.166190379 and -1.166190379.

Subproblem 1

x + 0.4 = 1.166190379 Simplifying x + 0.4 = 1.166190379 Reorder the terms: 0.4 + x = 1.166190379 Solving 0.4 + x = 1.166190379 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 1.166190379 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 1.166190379 + -0.4 x = 1.166190379 + -0.4 Combine like terms: 1.166190379 + -0.4 = 0.766190379 x = 0.766190379 Simplifying x = 0.766190379

Subproblem 2

x + 0.4 = -1.166190379 Simplifying x + 0.4 = -1.166190379 Reorder the terms: 0.4 + x = -1.166190379 Solving 0.4 + x = -1.166190379 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -1.166190379 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -1.166190379 + -0.4 x = -1.166190379 + -0.4 Combine like terms: -1.166190379 + -0.4 = -1.566190379 x = -1.566190379 Simplifying x = -1.566190379

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.766190379, -1.566190379}

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