x^2-16x=-20

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Solution for x^2-16x=-20 equation:


Simplifying
x2 + -16x = -20

Reorder the terms:
-16x + x2 = -20

Solving
-16x + x2 = -20

Solving for variable 'x'.

Reorder the terms:
20 + -16x + x2 = -20 + 20

Combine like terms: -20 + 20 = 0
20 + -16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -16x + -20 + x2 = 0 + -20

Reorder the terms:
20 + -20 + -16x + x2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -16x + x2 = 0 + -20
-16x + x2 = 0 + -20

Combine like terms: 0 + -20 = -20
-16x + x2 = -20

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 = -20 + 64

Reorder the terms:
64 + -16x + x2 = -20 + 64

Combine like terms: -20 + 64 = 44
64 + -16x + x2 = 44

Factor a perfect square on the left side:
(x + -8)(x + -8) = 44

Calculate the square root of the right side: 6.633249581

Break this problem into two subproblems by setting 
(x + -8) equal to 6.633249581 and -6.633249581.

Subproblem 1

x + -8 = 6.633249581 Simplifying x + -8 = 6.633249581 Reorder the terms: -8 + x = 6.633249581 Solving -8 + x = 6.633249581 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 = 6.633249581 + 8 Combine like terms: -8 + 8 = 0 0 + x = 6.633249581 + 8 x = 6.633249581 + 8 Combine like terms: 6.633249581 + 8 = 14.633249581 x = 14.633249581 Simplifying x = 14.633249581

Subproblem 2

x + -8 = -6.633249581 Simplifying x + -8 = -6.633249581 Reorder the terms: -8 + x = -6.633249581 Solving -8 + x = -6.633249581 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 = -6.633249581 + 8 Combine like terms: -8 + 8 = 0 0 + x = -6.633249581 + 8 x = -6.633249581 + 8 Combine like terms: -6.633249581 + 8 = 1.366750419 x = 1.366750419 Simplifying x = 1.366750419

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.633249581, 1.366750419}

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