3x^2-30x=4x^2-3x-18

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Solution for 3x^2-30x=4x^2-3x-18 equation:


Simplifying
3x2 + -30x = 4x2 + -3x + -18

Reorder the terms:
-30x + 3x2 = 4x2 + -3x + -18

Reorder the terms:
-30x + 3x2 = -18 + -3x + 4x2

Solving
-30x + 3x2 = -18 + -3x + 4x2

Solving for variable 'x'.

Reorder the terms:
18 + -30x + 3x + 3x2 + -4x2 = -18 + -3x + 4x2 + 18 + 3x + -4x2

Combine like terms: -30x + 3x = -27x
18 + -27x + 3x2 + -4x2 = -18 + -3x + 4x2 + 18 + 3x + -4x2

Combine like terms: 3x2 + -4x2 = -1x2
18 + -27x + -1x2 = -18 + -3x + 4x2 + 18 + 3x + -4x2

Reorder the terms:
18 + -27x + -1x2 = -18 + 18 + -3x + 3x + 4x2 + -4x2

Combine like terms: -18 + 18 = 0
18 + -27x + -1x2 = 0 + -3x + 3x + 4x2 + -4x2
18 + -27x + -1x2 = -3x + 3x + 4x2 + -4x2

Combine like terms: -3x + 3x = 0
18 + -27x + -1x2 = 0 + 4x2 + -4x2
18 + -27x + -1x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
18 + -27x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-18 + 27x + x2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 27x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + 27x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 27x + x2 = 0 + 18
27x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
27x + x2 = 18

The x term is 27x.  Take half its coefficient (13.5).
Square it (182.25) and add it to both sides.

Add '182.25' to each side of the equation.
27x + 182.25 + x2 = 18 + 182.25

Reorder the terms:
182.25 + 27x + x2 = 18 + 182.25

Combine like terms: 18 + 182.25 = 200.25
182.25 + 27x + x2 = 200.25

Factor a perfect square on the left side:
(x + 13.5)(x + 13.5) = 200.25

Calculate the square root of the right side: 14.150971698

Break this problem into two subproblems by setting 
(x + 13.5) equal to 14.150971698 and -14.150971698.

Subproblem 1

x + 13.5 = 14.150971698 Simplifying x + 13.5 = 14.150971698 Reorder the terms: 13.5 + x = 14.150971698 Solving 13.5 + x = 14.150971698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13.5' to each side of the equation. 13.5 + -13.5 + x = 14.150971698 + -13.5 Combine like terms: 13.5 + -13.5 = 0.0 0.0 + x = 14.150971698 + -13.5 x = 14.150971698 + -13.5 Combine like terms: 14.150971698 + -13.5 = 0.650971698 x = 0.650971698 Simplifying x = 0.650971698

Subproblem 2

x + 13.5 = -14.150971698 Simplifying x + 13.5 = -14.150971698 Reorder the terms: 13.5 + x = -14.150971698 Solving 13.5 + x = -14.150971698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13.5' to each side of the equation. 13.5 + -13.5 + x = -14.150971698 + -13.5 Combine like terms: 13.5 + -13.5 = 0.0 0.0 + x = -14.150971698 + -13.5 x = -14.150971698 + -13.5 Combine like terms: -14.150971698 + -13.5 = -27.650971698 x = -27.650971698 Simplifying x = -27.650971698

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.650971698, -27.650971698}

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