2x^2+7=12x+4

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Solution for 2x^2+7=12x+4 equation:


Simplifying
2x2 + 7 = 12x + 4

Reorder the terms:
7 + 2x2 = 12x + 4

Reorder the terms:
7 + 2x2 = 4 + 12x

Solving
7 + 2x2 = 4 + 12x

Solving for variable 'x'.

Reorder the terms:
7 + -4 + -12x + 2x2 = 4 + 12x + -4 + -12x

Combine like terms: 7 + -4 = 3
3 + -12x + 2x2 = 4 + 12x + -4 + -12x

Reorder the terms:
3 + -12x + 2x2 = 4 + -4 + 12x + -12x

Combine like terms: 4 + -4 = 0
3 + -12x + 2x2 = 0 + 12x + -12x
3 + -12x + 2x2 = 12x + -12x

Combine like terms: 12x + -12x = 0
3 + -12x + 2x2 = 0

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

Divide each side by '2'.
1.5 + -6x + x2 = 0

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + -6x + -1.5 + x2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + -6x + x2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + -6x + x2 = 0 + -1.5
-6x + x2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
-6x + x2 = -1.5

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = -1.5 + 9

Reorder the terms:
9 + -6x + x2 = -1.5 + 9

Combine like terms: -1.5 + 9 = 7.5
9 + -6x + x2 = 7.5

Factor a perfect square on the left side:
(x + -3)(x + -3) = 7.5

Calculate the square root of the right side: 2.738612788

Break this problem into two subproblems by setting 
(x + -3) equal to 2.738612788 and -2.738612788.

Subproblem 1

x + -3 = 2.738612788 Simplifying x + -3 = 2.738612788 Reorder the terms: -3 + x = 2.738612788 Solving -3 + x = 2.738612788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 2.738612788 + 3 Combine like terms: -3 + 3 = 0 0 + x = 2.738612788 + 3 x = 2.738612788 + 3 Combine like terms: 2.738612788 + 3 = 5.738612788 x = 5.738612788 Simplifying x = 5.738612788

Subproblem 2

x + -3 = -2.738612788 Simplifying x + -3 = -2.738612788 Reorder the terms: -3 + x = -2.738612788 Solving -3 + x = -2.738612788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -2.738612788 + 3 Combine like terms: -3 + 3 = 0 0 + x = -2.738612788 + 3 x = -2.738612788 + 3 Combine like terms: -2.738612788 + 3 = 0.261387212 x = 0.261387212 Simplifying x = 0.261387212

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.738612788, 0.261387212}

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