5x^2-62x-40=0

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Solution for 5x^2-62x-40=0 equation:


Simplifying
5x2 + -62x + -40 = 0

Reorder the terms:
-40 + -62x + 5x2 = 0

Solving
-40 + -62x + 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'.
-8 + -12.4x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -12.4x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + -12.4x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -12.4x + x2 = 0 + 8
-12.4x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
-12.4x + x2 = 8

The x term is -12.4x.  Take half its coefficient (-6.2).
Square it (38.44) and add it to both sides.

Add '38.44' to each side of the equation.
-12.4x + 38.44 + x2 = 8 + 38.44

Reorder the terms:
38.44 + -12.4x + x2 = 8 + 38.44

Combine like terms: 8 + 38.44 = 46.44
38.44 + -12.4x + x2 = 46.44

Factor a perfect square on the left side:
(x + -6.2)(x + -6.2) = 46.44

Calculate the square root of the right side: 6.814690015

Break this problem into two subproblems by setting 
(x + -6.2) equal to 6.814690015 and -6.814690015.

Subproblem 1

x + -6.2 = 6.814690015 Simplifying x + -6.2 = 6.814690015 Reorder the terms: -6.2 + x = 6.814690015 Solving -6.2 + x = 6.814690015 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.2' to each side of the equation. -6.2 + 6.2 + x = 6.814690015 + 6.2 Combine like terms: -6.2 + 6.2 = 0.0 0.0 + x = 6.814690015 + 6.2 x = 6.814690015 + 6.2 Combine like terms: 6.814690015 + 6.2 = 13.014690015 x = 13.014690015 Simplifying x = 13.014690015

Subproblem 2

x + -6.2 = -6.814690015 Simplifying x + -6.2 = -6.814690015 Reorder the terms: -6.2 + x = -6.814690015 Solving -6.2 + x = -6.814690015 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.2' to each side of the equation. -6.2 + 6.2 + x = -6.814690015 + 6.2 Combine like terms: -6.2 + 6.2 = 0.0 0.0 + x = -6.814690015 + 6.2 x = -6.814690015 + 6.2 Combine like terms: -6.814690015 + 6.2 = -0.614690015 x = -0.614690015 Simplifying x = -0.614690015

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.014690015, -0.614690015}

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