3x^2+2x^2=12x+18

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Solution for 3x^2+2x^2=12x+18 equation:


Simplifying
3x2 + 2x2 = 12x + 18

Combine like terms: 3x2 + 2x2 = 5x2
5x2 = 12x + 18

Reorder the terms:
5x2 = 18 + 12x

Solving
5x2 = 18 + 12x

Solving for variable 'x'.

Reorder the terms:
-18 + -12x + 5x2 = 18 + 12x + -18 + -12x

Reorder the terms:
-18 + -12x + 5x2 = 18 + -18 + 12x + -12x

Combine like terms: 18 + -18 = 0
-18 + -12x + 5x2 = 0 + 12x + -12x
-18 + -12x + 5x2 = 12x + -12x

Combine like terms: 12x + -12x = 0
-18 + -12x + 5x2 = 0

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

Divide each side by '5'.
-3.6 + -2.4x + x2 = 0

Move the constant term to the right:

Add '3.6' to each side of the equation.
-3.6 + -2.4x + 3.6 + x2 = 0 + 3.6

Reorder the terms:
-3.6 + 3.6 + -2.4x + x2 = 0 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
0.0 + -2.4x + x2 = 0 + 3.6
-2.4x + x2 = 0 + 3.6

Combine like terms: 0 + 3.6 = 3.6
-2.4x + x2 = 3.6

The x term is -2.4x.  Take half its coefficient (-1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
-2.4x + 1.44 + x2 = 3.6 + 1.44

Reorder the terms:
1.44 + -2.4x + x2 = 3.6 + 1.44

Combine like terms: 3.6 + 1.44 = 5.04
1.44 + -2.4x + x2 = 5.04

Factor a perfect square on the left side:
(x + -1.2)(x + -1.2) = 5.04

Calculate the square root of the right side: 2.244994432

Break this problem into two subproblems by setting 
(x + -1.2) equal to 2.244994432 and -2.244994432.

Subproblem 1

x + -1.2 = 2.244994432 Simplifying x + -1.2 = 2.244994432 Reorder the terms: -1.2 + x = 2.244994432 Solving -1.2 + x = 2.244994432 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = 2.244994432 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 2.244994432 + 1.2 x = 2.244994432 + 1.2 Combine like terms: 2.244994432 + 1.2 = 3.444994432 x = 3.444994432 Simplifying x = 3.444994432

Subproblem 2

x + -1.2 = -2.244994432 Simplifying x + -1.2 = -2.244994432 Reorder the terms: -1.2 + x = -2.244994432 Solving -1.2 + x = -2.244994432 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = -2.244994432 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = -2.244994432 + 1.2 x = -2.244994432 + 1.2 Combine like terms: -2.244994432 + 1.2 = -1.044994432 x = -1.044994432 Simplifying x = -1.044994432

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.444994432, -1.044994432}

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