j^2-2j=9

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Solution for j^2-2j=9 equation:


Simplifying
j2 + -2j = 9

Reorder the terms:
-2j + j2 = 9

Solving
-2j + j2 = 9

Solving for variable 'j'.

Reorder the terms:
-9 + -2j + j2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -2j + j2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -2j + 9 + j2 = 0 + 9

Reorder the terms:
-9 + 9 + -2j + j2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -2j + j2 = 0 + 9
-2j + j2 = 0 + 9

Combine like terms: 0 + 9 = 9
-2j + j2 = 9

The j term is -2j.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2j + 1 + j2 = 9 + 1

Reorder the terms:
1 + -2j + j2 = 9 + 1

Combine like terms: 9 + 1 = 10
1 + -2j + j2 = 10

Factor a perfect square on the left side:
(j + -1)(j + -1) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(j + -1) equal to 3.16227766 and -3.16227766.

Subproblem 1

j + -1 = 3.16227766 Simplifying j + -1 = 3.16227766 Reorder the terms: -1 + j = 3.16227766 Solving -1 + j = 3.16227766 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + j = 3.16227766 + 1 Combine like terms: -1 + 1 = 0 0 + j = 3.16227766 + 1 j = 3.16227766 + 1 Combine like terms: 3.16227766 + 1 = 4.16227766 j = 4.16227766 Simplifying j = 4.16227766

Subproblem 2

j + -1 = -3.16227766 Simplifying j + -1 = -3.16227766 Reorder the terms: -1 + j = -3.16227766 Solving -1 + j = -3.16227766 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + j = -3.16227766 + 1 Combine like terms: -1 + 1 = 0 0 + j = -3.16227766 + 1 j = -3.16227766 + 1 Combine like terms: -3.16227766 + 1 = -2.16227766 j = -2.16227766 Simplifying j = -2.16227766

Solution

The solution to the problem is based on the solutions from the subproblems. j = {4.16227766, -2.16227766}

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