0.1x^2-x=-1.1x^2+40

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Solution for 0.1x^2-x=-1.1x^2+40 equation:


Simplifying
0.1x2 + -1x = -1.1x2 + 40

Reorder the terms:
-1x + 0.1x2 = -1.1x2 + 40

Reorder the terms:
-1x + 0.1x2 = 40 + -1.1x2

Solving
-1x + 0.1x2 = 40 + -1.1x2

Solving for variable 'x'.

Reorder the terms:
-40 + -1x + 0.1x2 + 1.1x2 = 40 + -1.1x2 + -40 + 1.1x2

Combine like terms: 0.1x2 + 1.1x2 = 1.2x2
-40 + -1x + 1.2x2 = 40 + -1.1x2 + -40 + 1.1x2

Reorder the terms:
-40 + -1x + 1.2x2 = 40 + -40 + -1.1x2 + 1.1x2

Combine like terms: 40 + -40 = 0
-40 + -1x + 1.2x2 = 0 + -1.1x2 + 1.1x2
-40 + -1x + 1.2x2 = -1.1x2 + 1.1x2

Combine like terms: -1.1x2 + 1.1x2 = 0.0
-40 + -1x + 1.2x2 = 0.0

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

Divide each side by '1.2'.
-33.33333333 + -0.8333333333x + x2 = 0

Move the constant term to the right:

Add '33.33333333' to each side of the equation.
-33.33333333 + -0.8333333333x + 33.33333333 + x2 = 0 + 33.33333333

Reorder the terms:
-33.33333333 + 33.33333333 + -0.8333333333x + x2 = 0 + 33.33333333

Combine like terms: -33.33333333 + 33.33333333 = 0.00000000
0.00000000 + -0.8333333333x + x2 = 0 + 33.33333333
-0.8333333333x + x2 = 0 + 33.33333333

Combine like terms: 0 + 33.33333333 = 33.33333333
-0.8333333333x + x2 = 33.33333333

The x term is -0.8333333333x.  Take half its coefficient (-0.4166666667).
Square it (0.1736111111) and add it to both sides.

Add '0.1736111111' to each side of the equation.
-0.8333333333x + 0.1736111111 + x2 = 33.33333333 + 0.1736111111

Reorder the terms:
0.1736111111 + -0.8333333333x + x2 = 33.33333333 + 0.1736111111

Combine like terms: 33.33333333 + 0.1736111111 = 33.5069444411
0.1736111111 + -0.8333333333x + x2 = 33.5069444411

Factor a perfect square on the left side:
(x + -0.4166666667)(x + -0.4166666667) = 33.5069444411

Calculate the square root of the right side: 5.788518329

Break this problem into two subproblems by setting 
(x + -0.4166666667) equal to 5.788518329 and -5.788518329.

Subproblem 1

x + -0.4166666667 = 5.788518329 Simplifying x + -0.4166666667 = 5.788518329 Reorder the terms: -0.4166666667 + x = 5.788518329 Solving -0.4166666667 + x = 5.788518329 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4166666667' to each side of the equation. -0.4166666667 + 0.4166666667 + x = 5.788518329 + 0.4166666667 Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000 0.0000000000 + x = 5.788518329 + 0.4166666667 x = 5.788518329 + 0.4166666667 Combine like terms: 5.788518329 + 0.4166666667 = 6.2051849957 x = 6.2051849957 Simplifying x = 6.2051849957

Subproblem 2

x + -0.4166666667 = -5.788518329 Simplifying x + -0.4166666667 = -5.788518329 Reorder the terms: -0.4166666667 + x = -5.788518329 Solving -0.4166666667 + x = -5.788518329 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4166666667' to each side of the equation. -0.4166666667 + 0.4166666667 + x = -5.788518329 + 0.4166666667 Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000 0.0000000000 + x = -5.788518329 + 0.4166666667 x = -5.788518329 + 0.4166666667 Combine like terms: -5.788518329 + 0.4166666667 = -5.3718516623 x = -5.3718516623 Simplifying x = -5.3718516623

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.2051849957, -5.3718516623}

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