2x^2+28x-147=0

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Solution for 2x^2+28x-147=0 equation:


Simplifying
2x2 + 28x + -147 = 0

Reorder the terms:
-147 + 28x + 2x2 = 0

Solving
-147 + 28x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-73.5 + 14x + x2 = 0

Move the constant term to the right:

Add '73.5' to each side of the equation.
-73.5 + 14x + 73.5 + x2 = 0 + 73.5

Reorder the terms:
-73.5 + 73.5 + 14x + x2 = 0 + 73.5

Combine like terms: -73.5 + 73.5 = 0.0
0.0 + 14x + x2 = 0 + 73.5
14x + x2 = 0 + 73.5

Combine like terms: 0 + 73.5 = 73.5
14x + x2 = 73.5

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 73.5 + 49

Reorder the terms:
49 + 14x + x2 = 73.5 + 49

Combine like terms: 73.5 + 49 = 122.5
49 + 14x + x2 = 122.5

Factor a perfect square on the left side:
(x + 7)(x + 7) = 122.5

Calculate the square root of the right side: 11.067971811

Break this problem into two subproblems by setting 
(x + 7) equal to 11.067971811 and -11.067971811.

Subproblem 1

x + 7 = 11.067971811 Simplifying x + 7 = 11.067971811 Reorder the terms: 7 + x = 11.067971811 Solving 7 + x = 11.067971811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 11.067971811 + -7 Combine like terms: 7 + -7 = 0 0 + x = 11.067971811 + -7 x = 11.067971811 + -7 Combine like terms: 11.067971811 + -7 = 4.067971811 x = 4.067971811 Simplifying x = 4.067971811

Subproblem 2

x + 7 = -11.067971811 Simplifying x + 7 = -11.067971811 Reorder the terms: 7 + x = -11.067971811 Solving 7 + x = -11.067971811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -11.067971811 + -7 Combine like terms: 7 + -7 = 0 0 + x = -11.067971811 + -7 x = -11.067971811 + -7 Combine like terms: -11.067971811 + -7 = -18.067971811 x = -18.067971811 Simplifying x = -18.067971811

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.067971811, -18.067971811}

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