3.5x^2+35x+9=0

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Solution for 3.5x^2+35x+9=0 equation:


Simplifying
3.5x2 + 35x + 9 = 0

Reorder the terms:
9 + 35x + 3.5x2 = 0

Solving
9 + 35x + 3.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '3.5'.
2.571428571 + 10x + x2 = 0

Move the constant term to the right:

Add '-2.571428571' to each side of the equation.
2.571428571 + 10x + -2.571428571 + x2 = 0 + -2.571428571

Reorder the terms:
2.571428571 + -2.571428571 + 10x + x2 = 0 + -2.571428571

Combine like terms: 2.571428571 + -2.571428571 = 0.000000000
0.000000000 + 10x + x2 = 0 + -2.571428571
10x + x2 = 0 + -2.571428571

Combine like terms: 0 + -2.571428571 = -2.571428571
10x + x2 = -2.571428571

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = -2.571428571 + 25

Reorder the terms:
25 + 10x + x2 = -2.571428571 + 25

Combine like terms: -2.571428571 + 25 = 22.428571429
25 + 10x + x2 = 22.428571429

Factor a perfect square on the left side:
(x + 5)(x + 5) = 22.428571429

Calculate the square root of the right side: 4.735881273

Break this problem into two subproblems by setting 
(x + 5) equal to 4.735881273 and -4.735881273.

Subproblem 1

x + 5 = 4.735881273 Simplifying x + 5 = 4.735881273 Reorder the terms: 5 + x = 4.735881273 Solving 5 + x = 4.735881273 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 4.735881273 + -5 Combine like terms: 5 + -5 = 0 0 + x = 4.735881273 + -5 x = 4.735881273 + -5 Combine like terms: 4.735881273 + -5 = -0.264118727 x = -0.264118727 Simplifying x = -0.264118727

Subproblem 2

x + 5 = -4.735881273 Simplifying x + 5 = -4.735881273 Reorder the terms: 5 + x = -4.735881273 Solving 5 + x = -4.735881273 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -4.735881273 + -5 Combine like terms: 5 + -5 = 0 0 + x = -4.735881273 + -5 x = -4.735881273 + -5 Combine like terms: -4.735881273 + -5 = -9.735881273 x = -9.735881273 Simplifying x = -9.735881273

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.264118727, -9.735881273}

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