5x^2+16x-19=0

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Solution for 5x^2+16x-19=0 equation:


Simplifying
5x2 + 16x + -19 = 0

Reorder the terms:
-19 + 16x + 5x2 = 0

Solving
-19 + 16x + 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'.
-3.8 + 3.2x + x2 = 0

Move the constant term to the right:

Add '3.8' to each side of the equation.
-3.8 + 3.2x + 3.8 + x2 = 0 + 3.8

Reorder the terms:
-3.8 + 3.8 + 3.2x + x2 = 0 + 3.8

Combine like terms: -3.8 + 3.8 = 0.0
0.0 + 3.2x + x2 = 0 + 3.8
3.2x + x2 = 0 + 3.8

Combine like terms: 0 + 3.8 = 3.8
3.2x + x2 = 3.8

The x term is 3.2x.  Take half its coefficient (1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
3.2x + 2.56 + x2 = 3.8 + 2.56

Reorder the terms:
2.56 + 3.2x + x2 = 3.8 + 2.56

Combine like terms: 3.8 + 2.56 = 6.36
2.56 + 3.2x + x2 = 6.36

Factor a perfect square on the left side:
(x + 1.6)(x + 1.6) = 6.36

Calculate the square root of the right side: 2.521904043

Break this problem into two subproblems by setting 
(x + 1.6) equal to 2.521904043 and -2.521904043.

Subproblem 1

x + 1.6 = 2.521904043 Simplifying x + 1.6 = 2.521904043 Reorder the terms: 1.6 + x = 2.521904043 Solving 1.6 + x = 2.521904043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x = 2.521904043 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x = 2.521904043 + -1.6 x = 2.521904043 + -1.6 Combine like terms: 2.521904043 + -1.6 = 0.921904043 x = 0.921904043 Simplifying x = 0.921904043

Subproblem 2

x + 1.6 = -2.521904043 Simplifying x + 1.6 = -2.521904043 Reorder the terms: 1.6 + x = -2.521904043 Solving 1.6 + x = -2.521904043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x = -2.521904043 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x = -2.521904043 + -1.6 x = -2.521904043 + -1.6 Combine like terms: -2.521904043 + -1.6 = -4.121904043 x = -4.121904043 Simplifying x = -4.121904043

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.921904043, -4.121904043}

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