5(j-4)*j=-8

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Solution for 5(j-4)*j=-8 equation:


Simplifying
5(j + -4) * j = -8

Reorder the terms:
5(-4 + j) * j = -8

Reorder the terms for easier multiplication:
5j(-4 + j) = -8
(-4 * 5j + j * 5j) = -8
(-20j + 5j2) = -8

Solving
-20j + 5j2 = -8

Solving for variable 'j'.

Reorder the terms:
8 + -20j + 5j2 = -8 + 8

Combine like terms: -8 + 8 = 0
8 + -20j + 5j2 = 0

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

Divide each side by '5'.
1.6 + -4j + j2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + -4j + -1.6 + j2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + -4j + j2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + -4j + j2 = 0 + -1.6
-4j + j2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
-4j + j2 = -1.6

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

Add '4' to each side of the equation.
-4j + 4 + j2 = -1.6 + 4

Reorder the terms:
4 + -4j + j2 = -1.6 + 4

Combine like terms: -1.6 + 4 = 2.4
4 + -4j + j2 = 2.4

Factor a perfect square on the left side:
(j + -2)(j + -2) = 2.4

Calculate the square root of the right side: 1.549193338

Break this problem into two subproblems by setting 
(j + -2) equal to 1.549193338 and -1.549193338.

Subproblem 1

j + -2 = 1.549193338 Simplifying j + -2 = 1.549193338 Reorder the terms: -2 + j = 1.549193338 Solving -2 + j = 1.549193338 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + j = 1.549193338 + 2 Combine like terms: -2 + 2 = 0 0 + j = 1.549193338 + 2 j = 1.549193338 + 2 Combine like terms: 1.549193338 + 2 = 3.549193338 j = 3.549193338 Simplifying j = 3.549193338

Subproblem 2

j + -2 = -1.549193338 Simplifying j + -2 = -1.549193338 Reorder the terms: -2 + j = -1.549193338 Solving -2 + j = -1.549193338 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + j = -1.549193338 + 2 Combine like terms: -2 + 2 = 0 0 + j = -1.549193338 + 2 j = -1.549193338 + 2 Combine like terms: -1.549193338 + 2 = 0.450806662 j = 0.450806662 Simplifying j = 0.450806662

Solution

The solution to the problem is based on the solutions from the subproblems. j = {3.549193338, 0.450806662}

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