5x(8+x)=3

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Solution for 5x(8+x)=3 equation:


Simplifying
5x(8 + x) = 3
(8 * 5x + x * 5x) = 3
(40x + 5x2) = 3

Solving
40x + 5x2 = 3

Solving for variable 'x'.

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

Combine like terms: 3 + -3 = 0
-3 + 40x + 5x2 = 0

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 = 0.074309757 x = 0.074309757 Simplifying x = 0.074309757

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 = -8.074309757 x = -8.074309757 Simplifying x = -8.074309757

Solution

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

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