40x-5x^2+4=0

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Solution for 40x-5x^2+4=0 equation:


Simplifying
40x + -5x2 + 4 = 0

Reorder the terms:
4 + 40x + -5x2 = 0

Solving
4 + 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'.
-0.8 + -8x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -8x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -8x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -8x + x2 = 0 + 0.8
-8x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-8x + x2 = 0.8

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 = 0.8 + 16

Reorder the terms:
16 + -8x + x2 = 0.8 + 16

Combine like terms: 0.8 + 16 = 16.8
16 + -8x + x2 = 16.8

Factor a perfect square on the left side:
(x + -4)(x + -4) = 16.8

Calculate the square root of the right side: 4.098780306

Break this problem into two subproblems by setting 
(x + -4) equal to 4.098780306 and -4.098780306.

Subproblem 1

x + -4 = 4.098780306 Simplifying x + -4 = 4.098780306 Reorder the terms: -4 + x = 4.098780306 Solving -4 + x = 4.098780306 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 = 4.098780306 + 4 Combine like terms: -4 + 4 = 0 0 + x = 4.098780306 + 4 x = 4.098780306 + 4 Combine like terms: 4.098780306 + 4 = 8.098780306 x = 8.098780306 Simplifying x = 8.098780306

Subproblem 2

x + -4 = -4.098780306 Simplifying x + -4 = -4.098780306 Reorder the terms: -4 + x = -4.098780306 Solving -4 + x = -4.098780306 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 = -4.098780306 + 4 Combine like terms: -4 + 4 = 0 0 + x = -4.098780306 + 4 x = -4.098780306 + 4 Combine like terms: -4.098780306 + 4 = -0.098780306 x = -0.098780306 Simplifying x = -0.098780306

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.098780306, -0.098780306}

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