4x^2-18=11x

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Solution for 4x^2-18=11x equation:


Simplifying
4x2 + -18 = 11x

Reorder the terms:
-18 + 4x2 = 11x

Solving
-18 + 4x2 = 11x

Solving for variable 'x'.

Reorder the terms:
-18 + -11x + 4x2 = 11x + -11x

Combine like terms: 11x + -11x = 0
-18 + -11x + 4x2 = 0

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

Divide each side by '4'.
-4.5 + -2.75x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + -2.75x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + -2.75x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + -2.75x + x2 = 0 + 4.5
-2.75x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
-2.75x + x2 = 4.5

The x term is -2.75x.  Take half its coefficient (-1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
-2.75x + 1.890625 + x2 = 4.5 + 1.890625

Reorder the terms:
1.890625 + -2.75x + x2 = 4.5 + 1.890625

Combine like terms: 4.5 + 1.890625 = 6.390625
1.890625 + -2.75x + x2 = 6.390625

Factor a perfect square on the left side:
(x + -1.375)(x + -1.375) = 6.390625

Calculate the square root of the right side: 2.527968552

Break this problem into two subproblems by setting 
(x + -1.375) equal to 2.527968552 and -2.527968552.

Subproblem 1

x + -1.375 = 2.527968552 Simplifying x + -1.375 = 2.527968552 Reorder the terms: -1.375 + x = 2.527968552 Solving -1.375 + x = 2.527968552 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = 2.527968552 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = 2.527968552 + 1.375 x = 2.527968552 + 1.375 Combine like terms: 2.527968552 + 1.375 = 3.902968552 x = 3.902968552 Simplifying x = 3.902968552

Subproblem 2

x + -1.375 = -2.527968552 Simplifying x + -1.375 = -2.527968552 Reorder the terms: -1.375 + x = -2.527968552 Solving -1.375 + x = -2.527968552 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = -2.527968552 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = -2.527968552 + 1.375 x = -2.527968552 + 1.375 Combine like terms: -2.527968552 + 1.375 = -1.152968552 x = -1.152968552 Simplifying x = -1.152968552

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.902968552, -1.152968552}

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