x^2+28x=1040

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Solution for x^2+28x=1040 equation:


Simplifying
x2 + 28x = 1040

Reorder the terms:
28x + x2 = 1040

Solving
28x + x2 = 1040

Solving for variable 'x'.

Reorder the terms:
-1040 + 28x + x2 = 1040 + -1040

Combine like terms: 1040 + -1040 = 0
-1040 + 28x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1040' to each side of the equation.
-1040 + 28x + 1040 + x2 = 0 + 1040

Reorder the terms:
-1040 + 1040 + 28x + x2 = 0 + 1040

Combine like terms: -1040 + 1040 = 0
0 + 28x + x2 = 0 + 1040
28x + x2 = 0 + 1040

Combine like terms: 0 + 1040 = 1040
28x + x2 = 1040

The x term is 28x.  Take half its coefficient (14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
28x + 196 + x2 = 1040 + 196

Reorder the terms:
196 + 28x + x2 = 1040 + 196

Combine like terms: 1040 + 196 = 1236
196 + 28x + x2 = 1236

Factor a perfect square on the left side:
(x + 14)(x + 14) = 1236

Calculate the square root of the right side: 35.156791662

Break this problem into two subproblems by setting 
(x + 14) equal to 35.156791662 and -35.156791662.

Subproblem 1

x + 14 = 35.156791662 Simplifying x + 14 = 35.156791662 Reorder the terms: 14 + x = 35.156791662 Solving 14 + x = 35.156791662 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + x = 35.156791662 + -14 Combine like terms: 14 + -14 = 0 0 + x = 35.156791662 + -14 x = 35.156791662 + -14 Combine like terms: 35.156791662 + -14 = 21.156791662 x = 21.156791662 Simplifying x = 21.156791662

Subproblem 2

x + 14 = -35.156791662 Simplifying x + 14 = -35.156791662 Reorder the terms: 14 + x = -35.156791662 Solving 14 + x = -35.156791662 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + x = -35.156791662 + -14 Combine like terms: 14 + -14 = 0 0 + x = -35.156791662 + -14 x = -35.156791662 + -14 Combine like terms: -35.156791662 + -14 = -49.156791662 x = -49.156791662 Simplifying x = -49.156791662

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.156791662, -49.156791662}

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