5x^2-40x-3=0

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Solution for 5x^2-40x-3=0 equation:


Simplifying
5x2 + -40x + -3 = 0

Reorder the terms:
-3 + -40x + 5x2 = 0

Solving
-3 + -40x + 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'.
-0.6 + -8x + x2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -8x + 0.6 + x2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -8x + x2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -8x + x2 = 0 + 0.6
-8x + x2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-8x + x2 = 0.6

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 0.6 + 16

Reorder the terms:
16 + -8x + x2 = 0.6 + 16

Combine like terms: 0.6 + 16 = 16.6
16 + -8x + x2 = 16.6

Factor a perfect square on the left side:
(x + -4)(x + -4) = 16.6

Calculate the square root of the right side: 4.074309757

Break this problem into two subproblems by setting 
(x + -4) equal to 4.074309757 and -4.074309757.

Subproblem 1

x + -4 = 4.074309757 Simplifying x + -4 = 4.074309757 Reorder the terms: -4 + x = 4.074309757 Solving -4 + x = 4.074309757 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 4.074309757 + 4 Combine like terms: -4 + 4 = 0 0 + x = 4.074309757 + 4 x = 4.074309757 + 4 Combine like terms: 4.074309757 + 4 = 8.074309757 x = 8.074309757 Simplifying x = 8.074309757

Subproblem 2

x + -4 = -4.074309757 Simplifying x + -4 = -4.074309757 Reorder the terms: -4 + x = -4.074309757 Solving -4 + x = -4.074309757 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -4.074309757 + 4 Combine like terms: -4 + 4 = 0 0 + x = -4.074309757 + 4 x = -4.074309757 + 4 Combine like terms: -4.074309757 + 4 = -0.074309757 x = -0.074309757 Simplifying x = -0.074309757

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.074309757, -0.074309757}

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