5x^2=-4x+19

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Solution for 5x^2=-4x+19 equation:


Simplifying
5x2 = -4x + 19

Reorder the terms:
5x2 = 19 + -4x

Solving
5x2 = 19 + -4x

Solving for variable 'x'.

Reorder the terms:
-19 + 4x + 5x2 = 19 + -4x + -19 + 4x

Reorder the terms:
-19 + 4x + 5x2 = 19 + -19 + -4x + 4x

Combine like terms: 19 + -19 = 0
-19 + 4x + 5x2 = 0 + -4x + 4x
-19 + 4x + 5x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-19 + 4x + 5x2 = 0

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

Divide each side by '5'.
-3.8 + 0.8x + x2 = 0

Move the constant term to the right:

Add '3.8' to each side of the equation.
-3.8 + 0.8x + 3.8 + x2 = 0 + 3.8

Reorder the terms:
-3.8 + 3.8 + 0.8x + x2 = 0 + 3.8

Combine like terms: -3.8 + 3.8 = 0.0
0.0 + 0.8x + x2 = 0 + 3.8
0.8x + x2 = 0 + 3.8

Combine like terms: 0 + 3.8 = 3.8
0.8x + x2 = 3.8

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 3.8 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 3.8 + 0.16

Combine like terms: 3.8 + 0.16 = 3.96
0.16 + 0.8x + x2 = 3.96

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 3.96

Calculate the square root of the right side: 1.989974874

Break this problem into two subproblems by setting 
(x + 0.4) equal to 1.989974874 and -1.989974874.

Subproblem 1

x + 0.4 = 1.989974874 Simplifying x + 0.4 = 1.989974874 Reorder the terms: 0.4 + x = 1.989974874 Solving 0.4 + x = 1.989974874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 1.989974874 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 1.989974874 + -0.4 x = 1.989974874 + -0.4 Combine like terms: 1.989974874 + -0.4 = 1.589974874 x = 1.589974874 Simplifying x = 1.589974874

Subproblem 2

x + 0.4 = -1.989974874 Simplifying x + 0.4 = -1.989974874 Reorder the terms: 0.4 + x = -1.989974874 Solving 0.4 + x = -1.989974874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -1.989974874 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -1.989974874 + -0.4 x = -1.989974874 + -0.4 Combine like terms: -1.989974874 + -0.4 = -2.389974874 x = -2.389974874 Simplifying x = -2.389974874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.589974874, -2.389974874}

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