4x^2-17x=18

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Solution for 4x^2-17x=18 equation:


Simplifying
4x2 + -17x = 18

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

Solving
-17x + 4x2 = 18

Solving for variable 'x'.

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

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

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

Divide each side by '4'.
-4.5 + -4.25x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + -4.25x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + -4.25x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + -4.25x + x2 = 0 + 4.5
-4.25x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
-4.25x + x2 = 4.5

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 = 4.5 + 4.515625

Reorder the terms:
4.515625 + -4.25x + x2 = 4.5 + 4.515625

Combine like terms: 4.5 + 4.515625 = 9.015625
4.515625 + -4.25x + x2 = 9.015625

Factor a perfect square on the left side:
(x + -2.125)(x + -2.125) = 9.015625

Calculate the square root of the right side: 3.002603037

Break this problem into two subproblems by setting 
(x + -2.125) equal to 3.002603037 and -3.002603037.

Subproblem 1

x + -2.125 = 3.002603037 Simplifying x + -2.125 = 3.002603037 Reorder the terms: -2.125 + x = 3.002603037 Solving -2.125 + x = 3.002603037 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 = 3.002603037 + 2.125 Combine like terms: -2.125 + 2.125 = 0.000 0.000 + x = 3.002603037 + 2.125 x = 3.002603037 + 2.125 Combine like terms: 3.002603037 + 2.125 = 5.127603037 x = 5.127603037 Simplifying x = 5.127603037

Subproblem 2

x + -2.125 = -3.002603037 Simplifying x + -2.125 = -3.002603037 Reorder the terms: -2.125 + x = -3.002603037 Solving -2.125 + x = -3.002603037 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 = -3.002603037 + 2.125 Combine like terms: -2.125 + 2.125 = 0.000 0.000 + x = -3.002603037 + 2.125 x = -3.002603037 + 2.125 Combine like terms: -3.002603037 + 2.125 = -0.877603037 x = -0.877603037 Simplifying x = -0.877603037

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.127603037, -0.877603037}

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