7x^2+53x=28

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Solution for 7x^2+53x=28 equation:


Simplifying
7x2 + 53x = 28

Reorder the terms:
53x + 7x2 = 28

Solving
53x + 7x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + 53x + 7x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + 53x + 7x2 = 0

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

Divide each side by '7'.
-4 + 7.571428571x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 7.571428571x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 7.571428571x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 7.571428571x + x2 = 0 + 4
7.571428571x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
7.571428571x + x2 = 4

The x term is 7.571428571x.  Take half its coefficient (3.785714286).
Square it (14.33163266) and add it to both sides.

Add '14.33163266' to each side of the equation.
7.571428571x + 14.33163266 + x2 = 4 + 14.33163266

Reorder the terms:
14.33163266 + 7.571428571x + x2 = 4 + 14.33163266

Combine like terms: 4 + 14.33163266 = 18.33163266
14.33163266 + 7.571428571x + x2 = 18.33163266

Factor a perfect square on the left side:
(x + 3.785714286)(x + 3.785714286) = 18.33163266

Calculate the square root of the right side: 4.281545592

Break this problem into two subproblems by setting 
(x + 3.785714286) equal to 4.281545592 and -4.281545592.

Subproblem 1

x + 3.785714286 = 4.281545592 Simplifying x + 3.785714286 = 4.281545592 Reorder the terms: 3.785714286 + x = 4.281545592 Solving 3.785714286 + x = 4.281545592 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.785714286' to each side of the equation. 3.785714286 + -3.785714286 + x = 4.281545592 + -3.785714286 Combine like terms: 3.785714286 + -3.785714286 = 0.000000000 0.000000000 + x = 4.281545592 + -3.785714286 x = 4.281545592 + -3.785714286 Combine like terms: 4.281545592 + -3.785714286 = 0.495831306 x = 0.495831306 Simplifying x = 0.495831306

Subproblem 2

x + 3.785714286 = -4.281545592 Simplifying x + 3.785714286 = -4.281545592 Reorder the terms: 3.785714286 + x = -4.281545592 Solving 3.785714286 + x = -4.281545592 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.785714286' to each side of the equation. 3.785714286 + -3.785714286 + x = -4.281545592 + -3.785714286 Combine like terms: 3.785714286 + -3.785714286 = 0.000000000 0.000000000 + x = -4.281545592 + -3.785714286 x = -4.281545592 + -3.785714286 Combine like terms: -4.281545592 + -3.785714286 = -8.067259878 x = -8.067259878 Simplifying x = -8.067259878

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.495831306, -8.067259878}

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