(5x+5)+(2x^2+8x+3)=

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Solution for (5x+5)+(2x^2+8x+3)= equation:


Simplifying
(5x + 5) + (2x2 + 8x + 3) = 0

Reorder the terms:
(5 + 5x) + (2x2 + 8x + 3) = 0

Remove parenthesis around (5 + 5x)
5 + 5x + (2x2 + 8x + 3) = 0

Reorder the terms:
5 + 5x + (3 + 8x + 2x2) = 0

Remove parenthesis around (3 + 8x + 2x2)
5 + 5x + 3 + 8x + 2x2 = 0

Reorder the terms:
5 + 3 + 5x + 8x + 2x2 = 0

Combine like terms: 5 + 3 = 8
8 + 5x + 8x + 2x2 = 0

Combine like terms: 5x + 8x = 13x
8 + 13x + 2x2 = 0

Solving
8 + 13x + 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'.
4 + 6.5x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 6.5x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + 6.5x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 6.5x + x2 = 0 + -4
6.5x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
6.5x + x2 = -4

The x term is 6.5x.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5x + 10.5625 + x2 = -4 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = -4 + 10.5625

Combine like terms: -4 + 10.5625 = 6.5625
10.5625 + 6.5x + x2 = 6.5625

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 6.5625

Calculate the square root of the right side: 2.561737691

Break this problem into two subproblems by setting 
(x + 3.25) equal to 2.561737691 and -2.561737691.

Subproblem 1

x + 3.25 = 2.561737691 Simplifying x + 3.25 = 2.561737691 Reorder the terms: 3.25 + x = 2.561737691 Solving 3.25 + x = 2.561737691 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 2.561737691 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 2.561737691 + -3.25 x = 2.561737691 + -3.25 Combine like terms: 2.561737691 + -3.25 = -0.688262309 x = -0.688262309 Simplifying x = -0.688262309

Subproblem 2

x + 3.25 = -2.561737691 Simplifying x + 3.25 = -2.561737691 Reorder the terms: 3.25 + x = -2.561737691 Solving 3.25 + x = -2.561737691 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -2.561737691 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -2.561737691 + -3.25 x = -2.561737691 + -3.25 Combine like terms: -2.561737691 + -3.25 = -5.811737691 x = -5.811737691 Simplifying x = -5.811737691

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.688262309, -5.811737691}

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