x^2+16x=40

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Solution for x^2+16x=40 equation:


Simplifying
x2 + 16x = 40

Reorder the terms:
16x + x2 = 40

Solving
16x + x2 = 40

Solving for variable 'x'.

Reorder the terms:
-40 + 16x + x2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 16x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + 16x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 16x + x2 = 0 + 40
16x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
16x + x2 = 40

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = 40 + 64

Reorder the terms:
64 + 16x + x2 = 40 + 64

Combine like terms: 40 + 64 = 104
64 + 16x + x2 = 104

Factor a perfect square on the left side:
(x + 8)(x + 8) = 104

Calculate the square root of the right side: 10.198039027

Break this problem into two subproblems by setting 
(x + 8) equal to 10.198039027 and -10.198039027.

Subproblem 1

x + 8 = 10.198039027 Simplifying x + 8 = 10.198039027 Reorder the terms: 8 + x = 10.198039027 Solving 8 + x = 10.198039027 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 10.198039027 + -8 Combine like terms: 8 + -8 = 0 0 + x = 10.198039027 + -8 x = 10.198039027 + -8 Combine like terms: 10.198039027 + -8 = 2.198039027 x = 2.198039027 Simplifying x = 2.198039027

Subproblem 2

x + 8 = -10.198039027 Simplifying x + 8 = -10.198039027 Reorder the terms: 8 + x = -10.198039027 Solving 8 + x = -10.198039027 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -10.198039027 + -8 Combine like terms: 8 + -8 = 0 0 + x = -10.198039027 + -8 x = -10.198039027 + -8 Combine like terms: -10.198039027 + -8 = -18.198039027 x = -18.198039027 Simplifying x = -18.198039027

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.198039027, -18.198039027}

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