5x^2+34x+15=0

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Solution for 5x^2+34x+15=0 equation:


Simplifying
5x2 + 34x + 15 = 0

Reorder the terms:
15 + 34x + 5x2 = 0

Solving
15 + 34x + 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'.
3 + 6.8x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 6.8x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 6.8x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 6.8x + x2 = 0 + -3
6.8x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
6.8x + x2 = -3

The x term is 6.8x.  Take half its coefficient (3.4).
Square it (11.56) and add it to both sides.

Add '11.56' to each side of the equation.
6.8x + 11.56 + x2 = -3 + 11.56

Reorder the terms:
11.56 + 6.8x + x2 = -3 + 11.56

Combine like terms: -3 + 11.56 = 8.56
11.56 + 6.8x + x2 = 8.56

Factor a perfect square on the left side:
(x + 3.4)(x + 3.4) = 8.56

Calculate the square root of the right side: 2.925747768

Break this problem into two subproblems by setting 
(x + 3.4) equal to 2.925747768 and -2.925747768.

Subproblem 1

x + 3.4 = 2.925747768 Simplifying x + 3.4 = 2.925747768 Reorder the terms: 3.4 + x = 2.925747768 Solving 3.4 + x = 2.925747768 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.4' to each side of the equation. 3.4 + -3.4 + x = 2.925747768 + -3.4 Combine like terms: 3.4 + -3.4 = 0.0 0.0 + x = 2.925747768 + -3.4 x = 2.925747768 + -3.4 Combine like terms: 2.925747768 + -3.4 = -0.474252232 x = -0.474252232 Simplifying x = -0.474252232

Subproblem 2

x + 3.4 = -2.925747768 Simplifying x + 3.4 = -2.925747768 Reorder the terms: 3.4 + x = -2.925747768 Solving 3.4 + x = -2.925747768 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.4' to each side of the equation. 3.4 + -3.4 + x = -2.925747768 + -3.4 Combine like terms: 3.4 + -3.4 = 0.0 0.0 + x = -2.925747768 + -3.4 x = -2.925747768 + -3.4 Combine like terms: -2.925747768 + -3.4 = -6.325747768 x = -6.325747768 Simplifying x = -6.325747768

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.474252232, -6.325747768}

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