107=5x^2+2x

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Solution for 107=5x^2+2x equation:


Simplifying
107 = 5x2 + 2x

Reorder the terms:
107 = 2x + 5x2

Solving
107 = 2x + 5x2

Solving for variable 'x'.

Reorder the terms:
107 + -2x + -5x2 = 2x + -2x + 5x2 + -5x2

Combine like terms: 2x + -2x = 0
107 + -2x + -5x2 = 0 + 5x2 + -5x2
107 + -2x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
107 + -2x + -5x2 = 0

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

Divide each side by '-5'.
-21.4 + 0.4x + x2 = 0

Move the constant term to the right:

Add '21.4' to each side of the equation.
-21.4 + 0.4x + 21.4 + x2 = 0 + 21.4

Reorder the terms:
-21.4 + 21.4 + 0.4x + x2 = 0 + 21.4

Combine like terms: -21.4 + 21.4 = 0.0
0.0 + 0.4x + x2 = 0 + 21.4
0.4x + x2 = 0 + 21.4

Combine like terms: 0 + 21.4 = 21.4
0.4x + x2 = 21.4

The x term is 0.4x.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4x + 0.04 + x2 = 21.4 + 0.04

Reorder the terms:
0.04 + 0.4x + x2 = 21.4 + 0.04

Combine like terms: 21.4 + 0.04 = 21.44
0.04 + 0.4x + x2 = 21.44

Factor a perfect square on the left side:
(x + 0.2)(x + 0.2) = 21.44

Calculate the square root of the right side: 4.630334761

Break this problem into two subproblems by setting 
(x + 0.2) equal to 4.630334761 and -4.630334761.

Subproblem 1

x + 0.2 = 4.630334761 Simplifying x + 0.2 = 4.630334761 Reorder the terms: 0.2 + x = 4.630334761 Solving 0.2 + x = 4.630334761 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = 4.630334761 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = 4.630334761 + -0.2 x = 4.630334761 + -0.2 Combine like terms: 4.630334761 + -0.2 = 4.430334761 x = 4.430334761 Simplifying x = 4.430334761

Subproblem 2

x + 0.2 = -4.630334761 Simplifying x + 0.2 = -4.630334761 Reorder the terms: 0.2 + x = -4.630334761 Solving 0.2 + x = -4.630334761 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = -4.630334761 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = -4.630334761 + -0.2 x = -4.630334761 + -0.2 Combine like terms: -4.630334761 + -0.2 = -4.830334761 x = -4.830334761 Simplifying x = -4.830334761

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.430334761, -4.830334761}

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