5x^2+40x+38=0

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Solution for 5x^2+40x+38=0 equation:


Simplifying
5x2 + 40x + 38 = 0

Reorder the terms:
38 + 40x + 5x2 = 0

Solving
38 + 40x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
7.6 + 8x + x2 = 0

Move the constant term to the right:

Add '-7.6' to each side of the equation.
7.6 + 8x + -7.6 + x2 = 0 + -7.6

Reorder the terms:
7.6 + -7.6 + 8x + x2 = 0 + -7.6

Combine like terms: 7.6 + -7.6 = 0.0
0.0 + 8x + x2 = 0 + -7.6
8x + x2 = 0 + -7.6

Combine like terms: 0 + -7.6 = -7.6
8x + x2 = -7.6

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = -7.6 + 16

Reorder the terms:
16 + 8x + x2 = -7.6 + 16

Combine like terms: -7.6 + 16 = 8.4
16 + 8x + x2 = 8.4

Factor a perfect square on the left side:
(x + 4)(x + 4) = 8.4

Calculate the square root of the right side: 2.898275349

Break this problem into two subproblems by setting 
(x + 4) equal to 2.898275349 and -2.898275349.

Subproblem 1

x + 4 = 2.898275349 Simplifying x + 4 = 2.898275349 Reorder the terms: 4 + x = 2.898275349 Solving 4 + x = 2.898275349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 2.898275349 + -4 Combine like terms: 4 + -4 = 0 0 + x = 2.898275349 + -4 x = 2.898275349 + -4 Combine like terms: 2.898275349 + -4 = -1.101724651 x = -1.101724651 Simplifying x = -1.101724651

Subproblem 2

x + 4 = -2.898275349 Simplifying x + 4 = -2.898275349 Reorder the terms: 4 + x = -2.898275349 Solving 4 + x = -2.898275349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -2.898275349 + -4 Combine like terms: 4 + -4 = 0 0 + x = -2.898275349 + -4 x = -2.898275349 + -4 Combine like terms: -2.898275349 + -4 = -6.898275349 x = -6.898275349 Simplifying x = -6.898275349

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.101724651, -6.898275349}

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