5x-4x(x-3)=17

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Solution for 5x-4x(x-3)=17 equation:


Simplifying
5x + -4x(x + -3) = 17

Reorder the terms:
5x + -4x(-3 + x) = 17
5x + (-3 * -4x + x * -4x) = 17
5x + (12x + -4x2) = 17

Combine like terms: 5x + 12x = 17x
17x + -4x2 = 17

Solving
17x + -4x2 = 17

Solving for variable 'x'.

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

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

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

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

Move the constant term to the right:

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

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

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

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

The x term is -4.25x.  Take half its coefficient (-2.125).
Square it (4.515625) and add it to both sides.

Add '4.515625' to each side of the equation.
-4.25x + 4.515625 + x2 = -4.25 + 4.515625

Reorder the terms:
4.515625 + -4.25x + x2 = -4.25 + 4.515625

Combine like terms: -4.25 + 4.515625 = 0.265625
4.515625 + -4.25x + x2 = 0.265625

Factor a perfect square on the left side:
(x + -2.125)(x + -2.125) = 0.265625

Calculate the square root of the right side: 0.515388203

Break this problem into two subproblems by setting 
(x + -2.125) equal to 0.515388203 and -0.515388203.

Subproblem 1

x + -2.125 = 0.515388203 Simplifying x + -2.125 = 0.515388203 Reorder the terms: -2.125 + x = 0.515388203 Solving -2.125 + x = 0.515388203 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.125' to each side of the equation. -2.125 + 2.125 + x = 0.515388203 + 2.125 Combine like terms: -2.125 + 2.125 = 0.000 0.000 + x = 0.515388203 + 2.125 x = 0.515388203 + 2.125 Combine like terms: 0.515388203 + 2.125 = 2.640388203 x = 2.640388203 Simplifying x = 2.640388203

Subproblem 2

x + -2.125 = -0.515388203 Simplifying x + -2.125 = -0.515388203 Reorder the terms: -2.125 + x = -0.515388203 Solving -2.125 + x = -0.515388203 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.125' to each side of the equation. -2.125 + 2.125 + x = -0.515388203 + 2.125 Combine like terms: -2.125 + 2.125 = 0.000 0.000 + x = -0.515388203 + 2.125 x = -0.515388203 + 2.125 Combine like terms: -0.515388203 + 2.125 = 1.609611797 x = 1.609611797 Simplifying x = 1.609611797

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.640388203, 1.609611797}

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