4x^2-8x=17

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Solution for 4x^2-8x=17 equation:


Simplifying
4x2 + -8x = 17

Reorder the terms:
-8x + 4x2 = 17

Solving
-8x + 4x2 = 17

Solving for variable 'x'.

Reorder the terms:
-17 + -8x + 4x2 = 17 + -17

Combine like terms: 17 + -17 = 0
-17 + -8x + 4x2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-4.25 + -2x + x2 = 0

Move the constant term to the right:

Add '4.25' to each side of the equation.
-4.25 + -2x + 4.25 + x2 = 0 + 4.25

Reorder the terms:
-4.25 + 4.25 + -2x + x2 = 0 + 4.25

Combine like terms: -4.25 + 4.25 = 0.00
0.00 + -2x + x2 = 0 + 4.25
-2x + x2 = 0 + 4.25

Combine like terms: 0 + 4.25 = 4.25
-2x + x2 = 4.25

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 4.25 + 1

Reorder the terms:
1 + -2x + x2 = 4.25 + 1

Combine like terms: 4.25 + 1 = 5.25
1 + -2x + x2 = 5.25

Factor a perfect square on the left side:
(x + -1)(x + -1) = 5.25

Calculate the square root of the right side: 2.291287847

Break this problem into two subproblems by setting 
(x + -1) equal to 2.291287847 and -2.291287847.

Subproblem 1

x + -1 = 2.291287847 Simplifying x + -1 = 2.291287847 Reorder the terms: -1 + x = 2.291287847 Solving -1 + x = 2.291287847 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 2.291287847 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.291287847 + 1 x = 2.291287847 + 1 Combine like terms: 2.291287847 + 1 = 3.291287847 x = 3.291287847 Simplifying x = 3.291287847

Subproblem 2

x + -1 = -2.291287847 Simplifying x + -1 = -2.291287847 Reorder the terms: -1 + x = -2.291287847 Solving -1 + x = -2.291287847 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -2.291287847 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.291287847 + 1 x = -2.291287847 + 1 Combine like terms: -2.291287847 + 1 = -1.291287847 x = -1.291287847 Simplifying x = -1.291287847

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.291287847, -1.291287847}

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