4x^2+2x^2+17x+8=0

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Solution for 4x^2+2x^2+17x+8=0 equation:


Simplifying
4x2 + 2x2 + 17x + 8 = 0

Reorder the terms:
8 + 17x + 4x2 + 2x2 = 0

Combine like terms: 4x2 + 2x2 = 6x2
8 + 17x + 6x2 = 0

Solving
8 + 17x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
1.333333333 + 2.833333333x + x2 = 0

Move the constant term to the right:

Add '-1.333333333' to each side of the equation.
1.333333333 + 2.833333333x + -1.333333333 + x2 = 0 + -1.333333333

Reorder the terms:
1.333333333 + -1.333333333 + 2.833333333x + x2 = 0 + -1.333333333

Combine like terms: 1.333333333 + -1.333333333 = 0.000000000
0.000000000 + 2.833333333x + x2 = 0 + -1.333333333
2.833333333x + x2 = 0 + -1.333333333

Combine like terms: 0 + -1.333333333 = -1.333333333
2.833333333x + x2 = -1.333333333

The x term is 2.833333333x.  Take half its coefficient (1.416666667).
Square it (2.006944445) and add it to both sides.

Add '2.006944445' to each side of the equation.
2.833333333x + 2.006944445 + x2 = -1.333333333 + 2.006944445

Reorder the terms:
2.006944445 + 2.833333333x + x2 = -1.333333333 + 2.006944445

Combine like terms: -1.333333333 + 2.006944445 = 0.673611112
2.006944445 + 2.833333333x + x2 = 0.673611112

Factor a perfect square on the left side:
(x + 1.416666667)(x + 1.416666667) = 0.673611112

Calculate the square root of the right side: 0.820738151

Break this problem into two subproblems by setting 
(x + 1.416666667) equal to 0.820738151 and -0.820738151.

Subproblem 1

x + 1.416666667 = 0.820738151 Simplifying x + 1.416666667 = 0.820738151 Reorder the terms: 1.416666667 + x = 0.820738151 Solving 1.416666667 + x = 0.820738151 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.416666667' to each side of the equation. 1.416666667 + -1.416666667 + x = 0.820738151 + -1.416666667 Combine like terms: 1.416666667 + -1.416666667 = 0.000000000 0.000000000 + x = 0.820738151 + -1.416666667 x = 0.820738151 + -1.416666667 Combine like terms: 0.820738151 + -1.416666667 = -0.595928516 x = -0.595928516 Simplifying x = -0.595928516

Subproblem 2

x + 1.416666667 = -0.820738151 Simplifying x + 1.416666667 = -0.820738151 Reorder the terms: 1.416666667 + x = -0.820738151 Solving 1.416666667 + x = -0.820738151 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.416666667' to each side of the equation. 1.416666667 + -1.416666667 + x = -0.820738151 + -1.416666667 Combine like terms: 1.416666667 + -1.416666667 = 0.000000000 0.000000000 + x = -0.820738151 + -1.416666667 x = -0.820738151 + -1.416666667 Combine like terms: -0.820738151 + -1.416666667 = -2.237404818 x = -2.237404818 Simplifying x = -2.237404818

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.595928516, -2.237404818}

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