13x^2-73x=380

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Solution for 13x^2-73x=380 equation:


Simplifying
13x2 + -73x = 380

Reorder the terms:
-73x + 13x2 = 380

Solving
-73x + 13x2 = 380

Solving for variable 'x'.

Reorder the terms:
-380 + -73x + 13x2 = 380 + -380

Combine like terms: 380 + -380 = 0
-380 + -73x + 13x2 = 0

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

Divide each side by '13'.
-29.23076923 + -5.615384615x + x2 = 0

Move the constant term to the right:

Add '29.23076923' to each side of the equation.
-29.23076923 + -5.615384615x + 29.23076923 + x2 = 0 + 29.23076923

Reorder the terms:
-29.23076923 + 29.23076923 + -5.615384615x + x2 = 0 + 29.23076923

Combine like terms: -29.23076923 + 29.23076923 = 0.00000000
0.00000000 + -5.615384615x + x2 = 0 + 29.23076923
-5.615384615x + x2 = 0 + 29.23076923

Combine like terms: 0 + 29.23076923 = 29.23076923
-5.615384615x + x2 = 29.23076923

The x term is -5.615384615x.  Take half its coefficient (-2.807692308).
Square it (7.883136096) and add it to both sides.

Add '7.883136096' to each side of the equation.
-5.615384615x + 7.883136096 + x2 = 29.23076923 + 7.883136096

Reorder the terms:
7.883136096 + -5.615384615x + x2 = 29.23076923 + 7.883136096

Combine like terms: 29.23076923 + 7.883136096 = 37.113905326
7.883136096 + -5.615384615x + x2 = 37.113905326

Factor a perfect square on the left side:
(x + -2.807692308)(x + -2.807692308) = 37.113905326

Calculate the square root of the right side: 6.092118295

Break this problem into two subproblems by setting 
(x + -2.807692308) equal to 6.092118295 and -6.092118295.

Subproblem 1

x + -2.807692308 = 6.092118295 Simplifying x + -2.807692308 = 6.092118295 Reorder the terms: -2.807692308 + x = 6.092118295 Solving -2.807692308 + x = 6.092118295 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.807692308' to each side of the equation. -2.807692308 + 2.807692308 + x = 6.092118295 + 2.807692308 Combine like terms: -2.807692308 + 2.807692308 = 0.000000000 0.000000000 + x = 6.092118295 + 2.807692308 x = 6.092118295 + 2.807692308 Combine like terms: 6.092118295 + 2.807692308 = 8.899810603 x = 8.899810603 Simplifying x = 8.899810603

Subproblem 2

x + -2.807692308 = -6.092118295 Simplifying x + -2.807692308 = -6.092118295 Reorder the terms: -2.807692308 + x = -6.092118295 Solving -2.807692308 + x = -6.092118295 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.807692308' to each side of the equation. -2.807692308 + 2.807692308 + x = -6.092118295 + 2.807692308 Combine like terms: -2.807692308 + 2.807692308 = 0.000000000 0.000000000 + x = -6.092118295 + 2.807692308 x = -6.092118295 + 2.807692308 Combine like terms: -6.092118295 + 2.807692308 = -3.284425987 x = -3.284425987 Simplifying x = -3.284425987

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.899810603, -3.284425987}

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