X(X+4)=74

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Solution for X(X+4)=74 equation:


Simplifying
X(X + 4) = 74

Reorder the terms:
X(4 + X) = 74
(4 * X + X * X) = 74
(4X + X2) = 74

Solving
4X + X2 = 74

Solving for variable 'X'.

Reorder the terms:
-74 + 4X + X2 = 74 + -74

Combine like terms: 74 + -74 = 0
-74 + 4X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '74' to each side of the equation.
-74 + 4X + 74 + X2 = 0 + 74

Reorder the terms:
-74 + 74 + 4X + X2 = 0 + 74

Combine like terms: -74 + 74 = 0
0 + 4X + X2 = 0 + 74
4X + X2 = 0 + 74

Combine like terms: 0 + 74 = 74
4X + X2 = 74

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 = 74 + 4

Reorder the terms:
4 + 4X + X2 = 74 + 4

Combine like terms: 74 + 4 = 78
4 + 4X + X2 = 78

Factor a perfect square on the left side:
(X + 2)(X + 2) = 78

Calculate the square root of the right side: 8.831760866

Break this problem into two subproblems by setting 
(X + 2) equal to 8.831760866 and -8.831760866.

Subproblem 1

X + 2 = 8.831760866 Simplifying X + 2 = 8.831760866 Reorder the terms: 2 + X = 8.831760866 Solving 2 + X = 8.831760866 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 = 8.831760866 + -2 Combine like terms: 2 + -2 = 0 0 + X = 8.831760866 + -2 X = 8.831760866 + -2 Combine like terms: 8.831760866 + -2 = 6.831760866 X = 6.831760866 Simplifying X = 6.831760866

Subproblem 2

X + 2 = -8.831760866 Simplifying X + 2 = -8.831760866 Reorder the terms: 2 + X = -8.831760866 Solving 2 + X = -8.831760866 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 = -8.831760866 + -2 Combine like terms: 2 + -2 = 0 0 + X = -8.831760866 + -2 X = -8.831760866 + -2 Combine like terms: -8.831760866 + -2 = -10.831760866 X = -10.831760866 Simplifying X = -10.831760866

Solution

The solution to the problem is based on the solutions from the subproblems. X = {6.831760866, -10.831760866}

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