j^2-10j=13

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Solution for j^2-10j=13 equation:


Simplifying
j2 + -10j = 13

Reorder the terms:
-10j + j2 = 13

Solving
-10j + j2 = 13

Solving for variable 'j'.

Reorder the terms:
-13 + -10j + j2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + -10j + j2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + -10j + 13 + j2 = 0 + 13

Reorder the terms:
-13 + 13 + -10j + j2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -10j + j2 = 0 + 13
-10j + j2 = 0 + 13

Combine like terms: 0 + 13 = 13
-10j + j2 = 13

The j term is -10j.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10j + 25 + j2 = 13 + 25

Reorder the terms:
25 + -10j + j2 = 13 + 25

Combine like terms: 13 + 25 = 38
25 + -10j + j2 = 38

Factor a perfect square on the left side:
(j + -5)(j + -5) = 38

Calculate the square root of the right side: 6.164414003

Break this problem into two subproblems by setting 
(j + -5) equal to 6.164414003 and -6.164414003.

Subproblem 1

j + -5 = 6.164414003 Simplifying j + -5 = 6.164414003 Reorder the terms: -5 + j = 6.164414003 Solving -5 + j = 6.164414003 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + j = 6.164414003 + 5 Combine like terms: -5 + 5 = 0 0 + j = 6.164414003 + 5 j = 6.164414003 + 5 Combine like terms: 6.164414003 + 5 = 11.164414003 j = 11.164414003 Simplifying j = 11.164414003

Subproblem 2

j + -5 = -6.164414003 Simplifying j + -5 = -6.164414003 Reorder the terms: -5 + j = -6.164414003 Solving -5 + j = -6.164414003 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + j = -6.164414003 + 5 Combine like terms: -5 + 5 = 0 0 + j = -6.164414003 + 5 j = -6.164414003 + 5 Combine like terms: -6.164414003 + 5 = -1.164414003 j = -1.164414003 Simplifying j = -1.164414003

Solution

The solution to the problem is based on the solutions from the subproblems. j = {11.164414003, -1.164414003}

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