x^2+40x-480=0

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Solution for x^2+40x-480=0 equation:


Simplifying
x2 + 40x + -480 = 0

Reorder the terms:
-480 + 40x + x2 = 0

Solving
-480 + 40x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '480' to each side of the equation.
-480 + 40x + 480 + x2 = 0 + 480

Reorder the terms:
-480 + 480 + 40x + x2 = 0 + 480

Combine like terms: -480 + 480 = 0
0 + 40x + x2 = 0 + 480
40x + x2 = 0 + 480

Combine like terms: 0 + 480 = 480
40x + x2 = 480

The x term is 40x.  Take half its coefficient (20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
40x + 400 + x2 = 480 + 400

Reorder the terms:
400 + 40x + x2 = 480 + 400

Combine like terms: 480 + 400 = 880
400 + 40x + x2 = 880

Factor a perfect square on the left side:
(x + 20)(x + 20) = 880

Calculate the square root of the right side: 29.664793948

Break this problem into two subproblems by setting 
(x + 20) equal to 29.664793948 and -29.664793948.

Subproblem 1

x + 20 = 29.664793948 Simplifying x + 20 = 29.664793948 Reorder the terms: 20 + x = 29.664793948 Solving 20 + x = 29.664793948 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = 29.664793948 + -20 Combine like terms: 20 + -20 = 0 0 + x = 29.664793948 + -20 x = 29.664793948 + -20 Combine like terms: 29.664793948 + -20 = 9.664793948 x = 9.664793948 Simplifying x = 9.664793948

Subproblem 2

x + 20 = -29.664793948 Simplifying x + 20 = -29.664793948 Reorder the terms: 20 + x = -29.664793948 Solving 20 + x = -29.664793948 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = -29.664793948 + -20 Combine like terms: 20 + -20 = 0 0 + x = -29.664793948 + -20 x = -29.664793948 + -20 Combine like terms: -29.664793948 + -20 = -49.664793948 x = -49.664793948 Simplifying x = -49.664793948

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.664793948, -49.664793948}

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