j^2-4j-49=0

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Solution for j^2-4j-49=0 equation:


Simplifying
j2 + -4j + -49 = 0

Reorder the terms:
-49 + -4j + j2 = 0

Solving
-49 + -4j + j2 = 0

Solving for variable 'j'.

Begin completing the square.

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + -4j + 49 + j2 = 0 + 49

Reorder the terms:
-49 + 49 + -4j + j2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + -4j + j2 = 0 + 49
-4j + j2 = 0 + 49

Combine like terms: 0 + 49 = 49
-4j + j2 = 49

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 = 49 + 4

Reorder the terms:
4 + -4j + j2 = 49 + 4

Combine like terms: 49 + 4 = 53
4 + -4j + j2 = 53

Factor a perfect square on the left side:
(j + -2)(j + -2) = 53

Calculate the square root of the right side: 7.280109889

Break this problem into two subproblems by setting 
(j + -2) equal to 7.280109889 and -7.280109889.

Subproblem 1

j + -2 = 7.280109889 Simplifying j + -2 = 7.280109889 Reorder the terms: -2 + j = 7.280109889 Solving -2 + j = 7.280109889 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 = 7.280109889 + 2 Combine like terms: -2 + 2 = 0 0 + j = 7.280109889 + 2 j = 7.280109889 + 2 Combine like terms: 7.280109889 + 2 = 9.280109889 j = 9.280109889 Simplifying j = 9.280109889

Subproblem 2

j + -2 = -7.280109889 Simplifying j + -2 = -7.280109889 Reorder the terms: -2 + j = -7.280109889 Solving -2 + j = -7.280109889 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 = -7.280109889 + 2 Combine like terms: -2 + 2 = 0 0 + j = -7.280109889 + 2 j = -7.280109889 + 2 Combine like terms: -7.280109889 + 2 = -5.280109889 j = -5.280109889 Simplifying j = -5.280109889

Solution

The solution to the problem is based on the solutions from the subproblems. j = {9.280109889, -5.280109889}

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