(x-2)(x+2)+17=18x

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Solution for (x-2)(x+2)+17=18x equation:


Simplifying
(x + -2)(x + 2) + 17 = 18x

Reorder the terms:
(-2 + x)(x + 2) + 17 = 18x

Reorder the terms:
(-2 + x)(2 + x) + 17 = 18x

Multiply (-2 + x) * (2 + x)
(-2(2 + x) + x(2 + x)) + 17 = 18x
((2 * -2 + x * -2) + x(2 + x)) + 17 = 18x
((-4 + -2x) + x(2 + x)) + 17 = 18x
(-4 + -2x + (2 * x + x * x)) + 17 = 18x
(-4 + -2x + (2x + x2)) + 17 = 18x

Combine like terms: -2x + 2x = 0
(-4 + 0 + x2) + 17 = 18x
(-4 + x2) + 17 = 18x

Reorder the terms:
-4 + 17 + x2 = 18x

Combine like terms: -4 + 17 = 13
13 + x2 = 18x

Solving
13 + x2 = 18x

Solving for variable 'x'.

Reorder the terms:
13 + -18x + x2 = 18x + -18x

Combine like terms: 18x + -18x = 0
13 + -18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-13' to each side of the equation.
13 + -18x + -13 + x2 = 0 + -13

Reorder the terms:
13 + -13 + -18x + x2 = 0 + -13

Combine like terms: 13 + -13 = 0
0 + -18x + x2 = 0 + -13
-18x + x2 = 0 + -13

Combine like terms: 0 + -13 = -13
-18x + x2 = -13

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = -13 + 81

Reorder the terms:
81 + -18x + x2 = -13 + 81

Combine like terms: -13 + 81 = 68
81 + -18x + x2 = 68

Factor a perfect square on the left side:
(x + -9)(x + -9) = 68

Calculate the square root of the right side: 8.246211251

Break this problem into two subproblems by setting 
(x + -9) equal to 8.246211251 and -8.246211251.

Subproblem 1

x + -9 = 8.246211251 Simplifying x + -9 = 8.246211251 Reorder the terms: -9 + x = 8.246211251 Solving -9 + x = 8.246211251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 8.246211251 + 9 Combine like terms: -9 + 9 = 0 0 + x = 8.246211251 + 9 x = 8.246211251 + 9 Combine like terms: 8.246211251 + 9 = 17.246211251 x = 17.246211251 Simplifying x = 17.246211251

Subproblem 2

x + -9 = -8.246211251 Simplifying x + -9 = -8.246211251 Reorder the terms: -9 + x = -8.246211251 Solving -9 + x = -8.246211251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -8.246211251 + 9 Combine like terms: -9 + 9 = 0 0 + x = -8.246211251 + 9 x = -8.246211251 + 9 Combine like terms: -8.246211251 + 9 = 0.753788749 x = 0.753788749 Simplifying x = 0.753788749

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.246211251, 0.753788749}

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