5x^2+35x+12=0

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Solution for 5x^2+35x+12=0 equation:


Simplifying
5x2 + 35x + 12 = 0

Reorder the terms:
12 + 35x + 5x2 = 0

Solving
12 + 35x + 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'.
2.4 + 7x + x2 = 0

Move the constant term to the right:

Add '-2.4' to each side of the equation.
2.4 + 7x + -2.4 + x2 = 0 + -2.4

Reorder the terms:
2.4 + -2.4 + 7x + x2 = 0 + -2.4

Combine like terms: 2.4 + -2.4 = 0.0
0.0 + 7x + x2 = 0 + -2.4
7x + x2 = 0 + -2.4

Combine like terms: 0 + -2.4 = -2.4
7x + x2 = -2.4

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = -2.4 + 12.25

Reorder the terms:
12.25 + 7x + x2 = -2.4 + 12.25

Combine like terms: -2.4 + 12.25 = 9.85
12.25 + 7x + x2 = 9.85

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 9.85

Calculate the square root of the right side: 3.138470965

Break this problem into two subproblems by setting 
(x + 3.5) equal to 3.138470965 and -3.138470965.

Subproblem 1

x + 3.5 = 3.138470965 Simplifying x + 3.5 = 3.138470965 Reorder the terms: 3.5 + x = 3.138470965 Solving 3.5 + x = 3.138470965 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 3.138470965 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 3.138470965 + -3.5 x = 3.138470965 + -3.5 Combine like terms: 3.138470965 + -3.5 = -0.361529035 x = -0.361529035 Simplifying x = -0.361529035

Subproblem 2

x + 3.5 = -3.138470965 Simplifying x + 3.5 = -3.138470965 Reorder the terms: 3.5 + x = -3.138470965 Solving 3.5 + x = -3.138470965 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -3.138470965 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -3.138470965 + -3.5 x = -3.138470965 + -3.5 Combine like terms: -3.138470965 + -3.5 = -6.638470965 x = -6.638470965 Simplifying x = -6.638470965

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.361529035, -6.638470965}

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