3x^2-31x+36=4x^2-59x+15

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Solution for 3x^2-31x+36=4x^2-59x+15 equation:


Simplifying
3x2 + -31x + 36 = 4x2 + -59x + 15

Reorder the terms:
36 + -31x + 3x2 = 4x2 + -59x + 15

Reorder the terms:
36 + -31x + 3x2 = 15 + -59x + 4x2

Solving
36 + -31x + 3x2 = 15 + -59x + 4x2

Solving for variable 'x'.

Reorder the terms:
36 + -15 + -31x + 59x + 3x2 + -4x2 = 15 + -59x + 4x2 + -15 + 59x + -4x2

Combine like terms: 36 + -15 = 21
21 + -31x + 59x + 3x2 + -4x2 = 15 + -59x + 4x2 + -15 + 59x + -4x2

Combine like terms: -31x + 59x = 28x
21 + 28x + 3x2 + -4x2 = 15 + -59x + 4x2 + -15 + 59x + -4x2

Combine like terms: 3x2 + -4x2 = -1x2
21 + 28x + -1x2 = 15 + -59x + 4x2 + -15 + 59x + -4x2

Reorder the terms:
21 + 28x + -1x2 = 15 + -15 + -59x + 59x + 4x2 + -4x2

Combine like terms: 15 + -15 = 0
21 + 28x + -1x2 = 0 + -59x + 59x + 4x2 + -4x2
21 + 28x + -1x2 = -59x + 59x + 4x2 + -4x2

Combine like terms: -59x + 59x = 0
21 + 28x + -1x2 = 0 + 4x2 + -4x2
21 + 28x + -1x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
21 + 28x + -1x2 = 0

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

Divide each side by '-1'.
-21 + -28x + x2 = 0

Move the constant term to the right:

Add '21' to each side of the equation.
-21 + -28x + 21 + x2 = 0 + 21

Reorder the terms:
-21 + 21 + -28x + x2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -28x + x2 = 0 + 21
-28x + x2 = 0 + 21

Combine like terms: 0 + 21 = 21
-28x + x2 = 21

The x term is -28x.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28x + 196 + x2 = 21 + 196

Reorder the terms:
196 + -28x + x2 = 21 + 196

Combine like terms: 21 + 196 = 217
196 + -28x + x2 = 217

Factor a perfect square on the left side:
(x + -14)(x + -14) = 217

Calculate the square root of the right side: 14.730919863

Break this problem into two subproblems by setting 
(x + -14) equal to 14.730919863 and -14.730919863.

Subproblem 1

x + -14 = 14.730919863 Simplifying x + -14 = 14.730919863 Reorder the terms: -14 + x = 14.730919863 Solving -14 + x = 14.730919863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = 14.730919863 + 14 Combine like terms: -14 + 14 = 0 0 + x = 14.730919863 + 14 x = 14.730919863 + 14 Combine like terms: 14.730919863 + 14 = 28.730919863 x = 28.730919863 Simplifying x = 28.730919863

Subproblem 2

x + -14 = -14.730919863 Simplifying x + -14 = -14.730919863 Reorder the terms: -14 + x = -14.730919863 Solving -14 + x = -14.730919863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = -14.730919863 + 14 Combine like terms: -14 + 14 = 0 0 + x = -14.730919863 + 14 x = -14.730919863 + 14 Combine like terms: -14.730919863 + 14 = -0.730919863 x = -0.730919863 Simplifying x = -0.730919863

Solution

The solution to the problem is based on the solutions from the subproblems. x = {28.730919863, -0.730919863}

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