x^2+14x=900

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Solution for x^2+14x=900 equation:


Simplifying
x2 + 14x = 900

Reorder the terms:
14x + x2 = 900

Solving
14x + x2 = 900

Solving for variable 'x'.

Reorder the terms:
-900 + 14x + x2 = 900 + -900

Combine like terms: 900 + -900 = 0
-900 + 14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '900' to each side of the equation.
-900 + 14x + 900 + x2 = 0 + 900

Reorder the terms:
-900 + 900 + 14x + x2 = 0 + 900

Combine like terms: -900 + 900 = 0
0 + 14x + x2 = 0 + 900
14x + x2 = 0 + 900

Combine like terms: 0 + 900 = 900
14x + x2 = 900

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 900 + 49

Reorder the terms:
49 + 14x + x2 = 900 + 49

Combine like terms: 900 + 49 = 949
49 + 14x + x2 = 949

Factor a perfect square on the left side:
(x + 7)(x + 7) = 949

Calculate the square root of the right side: 30.805843601

Break this problem into two subproblems by setting 
(x + 7) equal to 30.805843601 and -30.805843601.

Subproblem 1

x + 7 = 30.805843601 Simplifying x + 7 = 30.805843601 Reorder the terms: 7 + x = 30.805843601 Solving 7 + x = 30.805843601 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 30.805843601 + -7 Combine like terms: 7 + -7 = 0 0 + x = 30.805843601 + -7 x = 30.805843601 + -7 Combine like terms: 30.805843601 + -7 = 23.805843601 x = 23.805843601 Simplifying x = 23.805843601

Subproblem 2

x + 7 = -30.805843601 Simplifying x + 7 = -30.805843601 Reorder the terms: 7 + x = -30.805843601 Solving 7 + x = -30.805843601 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -30.805843601 + -7 Combine like terms: 7 + -7 = 0 0 + x = -30.805843601 + -7 x = -30.805843601 + -7 Combine like terms: -30.805843601 + -7 = -37.805843601 x = -37.805843601 Simplifying x = -37.805843601

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.805843601, -37.805843601}

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