X^2-8X=17

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Solution for X^2-8X=17 equation:


Simplifying
X2 + -8X = 17

Reorder the terms:
-8X + X2 = 17

Solving
-8X + X2 = 17

Solving for variable 'X'.

Reorder the terms:
-17 + -8X + X2 = 17 + -17

Combine like terms: 17 + -17 = 0
-17 + -8X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '17' to each side of the equation.
-17 + -8X + 17 + X2 = 0 + 17

Reorder the terms:
-17 + 17 + -8X + X2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + -8X + X2 = 0 + 17
-8X + X2 = 0 + 17

Combine like terms: 0 + 17 = 17
-8X + X2 = 17

The X term is -8X.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8X + 16 + X2 = 17 + 16

Reorder the terms:
16 + -8X + X2 = 17 + 16

Combine like terms: 17 + 16 = 33
16 + -8X + X2 = 33

Factor a perfect square on the left side:
(X + -4)(X + -4) = 33

Calculate the square root of the right side: 5.744562647

Break this problem into two subproblems by setting 
(X + -4) equal to 5.744562647 and -5.744562647.

Subproblem 1

X + -4 = 5.744562647 Simplifying X + -4 = 5.744562647 Reorder the terms: -4 + X = 5.744562647 Solving -4 + X = 5.744562647 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + X = 5.744562647 + 4 Combine like terms: -4 + 4 = 0 0 + X = 5.744562647 + 4 X = 5.744562647 + 4 Combine like terms: 5.744562647 + 4 = 9.744562647 X = 9.744562647 Simplifying X = 9.744562647

Subproblem 2

X + -4 = -5.744562647 Simplifying X + -4 = -5.744562647 Reorder the terms: -4 + X = -5.744562647 Solving -4 + X = -5.744562647 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + X = -5.744562647 + 4 Combine like terms: -4 + 4 = 0 0 + X = -5.744562647 + 4 X = -5.744562647 + 4 Combine like terms: -5.744562647 + 4 = -1.744562647 X = -1.744562647 Simplifying X = -1.744562647

Solution

The solution to the problem is based on the solutions from the subproblems. X = {9.744562647, -1.744562647}

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