5x^2-6x-40=0

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Solution for 5x^2-6x-40=0 equation:


Simplifying
5x2 + -6x + -40 = 0

Reorder the terms:
-40 + -6x + 5x2 = 0

Solving
-40 + -6x + 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 + -1.2x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -1.2x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + -1.2x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -1.2x + x2 = 0 + 8
-1.2x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
-1.2x + x2 = 8

The x term is -1.2x.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2x + 0.36 + x2 = 8 + 0.36

Reorder the terms:
0.36 + -1.2x + x2 = 8 + 0.36

Combine like terms: 8 + 0.36 = 8.36
0.36 + -1.2x + x2 = 8.36

Factor a perfect square on the left side:
(x + -0.6)(x + -0.6) = 8.36

Calculate the square root of the right side: 2.891366459

Break this problem into two subproblems by setting 
(x + -0.6) equal to 2.891366459 and -2.891366459.

Subproblem 1

x + -0.6 = 2.891366459 Simplifying x + -0.6 = 2.891366459 Reorder the terms: -0.6 + x = 2.891366459 Solving -0.6 + x = 2.891366459 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = 2.891366459 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = 2.891366459 + 0.6 x = 2.891366459 + 0.6 Combine like terms: 2.891366459 + 0.6 = 3.491366459 x = 3.491366459 Simplifying x = 3.491366459

Subproblem 2

x + -0.6 = -2.891366459 Simplifying x + -0.6 = -2.891366459 Reorder the terms: -0.6 + x = -2.891366459 Solving -0.6 + x = -2.891366459 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = -2.891366459 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = -2.891366459 + 0.6 x = -2.891366459 + 0.6 Combine like terms: -2.891366459 + 0.6 = -2.291366459 x = -2.291366459 Simplifying x = -2.291366459

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.491366459, -2.291366459}

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