5x^2+19x+15=0

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Solution for 5x^2+19x+15=0 equation:


Simplifying
5x2 + 19x + 15 = 0

Reorder the terms:
15 + 19x + 5x2 = 0

Solving
15 + 19x + 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 + 3.8x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 3.8x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 3.8x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 3.8x + x2 = 0 + -3
3.8x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
3.8x + x2 = -3

The x term is 3.8x.  Take half its coefficient (1.9).
Square it (3.61) and add it to both sides.

Add '3.61' to each side of the equation.
3.8x + 3.61 + x2 = -3 + 3.61

Reorder the terms:
3.61 + 3.8x + x2 = -3 + 3.61

Combine like terms: -3 + 3.61 = 0.61
3.61 + 3.8x + x2 = 0.61

Factor a perfect square on the left side:
(x + 1.9)(x + 1.9) = 0.61

Calculate the square root of the right side: 0.781024968

Break this problem into two subproblems by setting 
(x + 1.9) equal to 0.781024968 and -0.781024968.

Subproblem 1

x + 1.9 = 0.781024968 Simplifying x + 1.9 = 0.781024968 Reorder the terms: 1.9 + x = 0.781024968 Solving 1.9 + x = 0.781024968 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9' to each side of the equation. 1.9 + -1.9 + x = 0.781024968 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = 0.781024968 + -1.9 x = 0.781024968 + -1.9 Combine like terms: 0.781024968 + -1.9 = -1.118975032 x = -1.118975032 Simplifying x = -1.118975032

Subproblem 2

x + 1.9 = -0.781024968 Simplifying x + 1.9 = -0.781024968 Reorder the terms: 1.9 + x = -0.781024968 Solving 1.9 + x = -0.781024968 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9' to each side of the equation. 1.9 + -1.9 + x = -0.781024968 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = -0.781024968 + -1.9 x = -0.781024968 + -1.9 Combine like terms: -0.781024968 + -1.9 = -2.681024968 x = -2.681024968 Simplifying x = -2.681024968

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.118975032, -2.681024968}

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