7x(x+4)=8

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Solution for 7x(x+4)=8 equation:


Simplifying
7x(x + 4) = 8

Reorder the terms:
7x(4 + x) = 8
(4 * 7x + x * 7x) = 8
(28x + 7x2) = 8

Solving
28x + 7x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + 28x + 7x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 28x + 7x2 = 0

Begin completing the square.  Divide all terms by
7 the coefficient of the squared term: 

Divide each side by '7'.
-1.142857143 + 4x + x2 = 0

Move the constant term to the right:

Add '1.142857143' to each side of the equation.
-1.142857143 + 4x + 1.142857143 + x2 = 0 + 1.142857143

Reorder the terms:
-1.142857143 + 1.142857143 + 4x + x2 = 0 + 1.142857143

Combine like terms: -1.142857143 + 1.142857143 = 0.000000000
0.000000000 + 4x + x2 = 0 + 1.142857143
4x + x2 = 0 + 1.142857143

Combine like terms: 0 + 1.142857143 = 1.142857143
4x + x2 = 1.142857143

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 1.142857143 + 4

Reorder the terms:
4 + 4x + x2 = 1.142857143 + 4

Combine like terms: 1.142857143 + 4 = 5.142857143
4 + 4x + x2 = 5.142857143

Factor a perfect square on the left side:
(x + 2)(x + 2) = 5.142857143

Calculate the square root of the right side: 2.267786838

Break this problem into two subproblems by setting 
(x + 2) equal to 2.267786838 and -2.267786838.

Subproblem 1

x + 2 = 2.267786838 Simplifying x + 2 = 2.267786838 Reorder the terms: 2 + x = 2.267786838 Solving 2 + x = 2.267786838 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 2.267786838 + -2 Combine like terms: 2 + -2 = 0 0 + x = 2.267786838 + -2 x = 2.267786838 + -2 Combine like terms: 2.267786838 + -2 = 0.267786838 x = 0.267786838 Simplifying x = 0.267786838

Subproblem 2

x + 2 = -2.267786838 Simplifying x + 2 = -2.267786838 Reorder the terms: 2 + x = -2.267786838 Solving 2 + x = -2.267786838 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -2.267786838 + -2 Combine like terms: 2 + -2 = 0 0 + x = -2.267786838 + -2 x = -2.267786838 + -2 Combine like terms: -2.267786838 + -2 = -4.267786838 x = -4.267786838 Simplifying x = -4.267786838

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.267786838, -4.267786838}

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