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 = 15.4
16 + -8x + x2 = 15.4

Factor a perfect square on the left side:
(x + -4)(x + -4) = 15.4

Calculate the square root of the right side: 3.924283374

Break this problem into two subproblems by setting 
(x + -4) equal to 3.924283374 and -3.924283374.

Subproblem 1

x + -4 = 3.924283374 Simplifying x + -4 = 3.924283374 Reorder the terms: -4 + x = 3.924283374 Solving -4 + x = 3.924283374 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 = 3.924283374 + 4 Combine like terms: -4 + 4 = 0 0 + x = 3.924283374 + 4 x = 3.924283374 + 4 Combine like terms: 3.924283374 + 4 = 7.924283374 x = 7.924283374 Simplifying x = 7.924283374

Subproblem 2

x + -4 = -3.924283374 Simplifying x + -4 = -3.924283374 Reorder the terms: -4 + x = -3.924283374 Solving -4 + x = -3.924283374 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 = -3.924283374 + 4 Combine like terms: -4 + 4 = 0 0 + x = -3.924283374 + 4 x = -3.924283374 + 4 Combine like terms: -3.924283374 + 4 = 0.075716626 x = 0.075716626 Simplifying x = 0.075716626

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.924283374, 0.075716626}

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