5x^2+3x-80=0

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Solution for 5x^2+3x-80=0 equation:


Simplifying
5x2 + 3x + -80 = 0

Reorder the terms:
-80 + 3x + 5x2 = 0

Solving
-80 + 3x + 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'.
-16 + 0.6x + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 0.6x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + 0.6x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 0.6x + x2 = 0 + 16
0.6x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
0.6x + x2 = 16

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 16 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 16 + 0.09

Combine like terms: 16 + 0.09 = 16.09
0.09 + 0.6x + x2 = 16.09

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 16.09

Calculate the square root of the right side: 4.011234224

Break this problem into two subproblems by setting 
(x + 0.3) equal to 4.011234224 and -4.011234224.

Subproblem 1

x + 0.3 = 4.011234224 Simplifying x + 0.3 = 4.011234224 Reorder the terms: 0.3 + x = 4.011234224 Solving 0.3 + x = 4.011234224 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 4.011234224 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 4.011234224 + -0.3 x = 4.011234224 + -0.3 Combine like terms: 4.011234224 + -0.3 = 3.711234224 x = 3.711234224 Simplifying x = 3.711234224

Subproblem 2

x + 0.3 = -4.011234224 Simplifying x + 0.3 = -4.011234224 Reorder the terms: 0.3 + x = -4.011234224 Solving 0.3 + x = -4.011234224 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -4.011234224 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -4.011234224 + -0.3 x = -4.011234224 + -0.3 Combine like terms: -4.011234224 + -0.3 = -4.311234224 x = -4.311234224 Simplifying x = -4.311234224

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.711234224, -4.311234224}

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