5x^2+2x=80

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Solution for 5x^2+2x=80 equation:


Simplifying
5x2 + 2x = 80

Reorder the terms:
2x + 5x2 = 80

Solving
2x + 5x2 = 80

Solving for variable 'x'.

Reorder the terms:
-80 + 2x + 5x2 = 80 + -80

Combine like terms: 80 + -80 = 0
-80 + 2x + 5x2 = 0

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

Divide each side by '5'.
-16 + 0.4x + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 0.4x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + 0.4x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 0.4x + x2 = 0 + 16
0.4x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
0.4x + x2 = 16

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 = 16 + 0.04

Reorder the terms:
0.04 + 0.4x + x2 = 16 + 0.04

Combine like terms: 16 + 0.04 = 16.04
0.04 + 0.4x + x2 = 16.04

Factor a perfect square on the left side:
(x + 0.2)(x + 0.2) = 16.04

Calculate the square root of the right side: 4.004996879

Break this problem into two subproblems by setting 
(x + 0.2) equal to 4.004996879 and -4.004996879.

Subproblem 1

x + 0.2 = 4.004996879 Simplifying x + 0.2 = 4.004996879 Reorder the terms: 0.2 + x = 4.004996879 Solving 0.2 + x = 4.004996879 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 = 4.004996879 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = 4.004996879 + -0.2 x = 4.004996879 + -0.2 Combine like terms: 4.004996879 + -0.2 = 3.804996879 x = 3.804996879 Simplifying x = 3.804996879

Subproblem 2

x + 0.2 = -4.004996879 Simplifying x + 0.2 = -4.004996879 Reorder the terms: 0.2 + x = -4.004996879 Solving 0.2 + x = -4.004996879 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 = -4.004996879 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = -4.004996879 + -0.2 x = -4.004996879 + -0.2 Combine like terms: -4.004996879 + -0.2 = -4.204996879 x = -4.204996879 Simplifying x = -4.204996879

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.804996879, -4.204996879}

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