4x^2+5=13x

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Solution for 4x^2+5=13x equation:


Simplifying
4x2 + 5 = 13x

Reorder the terms:
5 + 4x2 = 13x

Solving
5 + 4x2 = 13x

Solving for variable 'x'.

Reorder the terms:
5 + -13x + 4x2 = 13x + -13x

Combine like terms: 13x + -13x = 0
5 + -13x + 4x2 = 0

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

Divide each side by '4'.
1.25 + -3.25x + x2 = 0

Move the constant term to the right:

Add '-1.25' to each side of the equation.
1.25 + -3.25x + -1.25 + x2 = 0 + -1.25

Reorder the terms:
1.25 + -1.25 + -3.25x + x2 = 0 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + -3.25x + x2 = 0 + -1.25
-3.25x + x2 = 0 + -1.25

Combine like terms: 0 + -1.25 = -1.25
-3.25x + x2 = -1.25

The x term is -3.25x.  Take half its coefficient (-1.625).
Square it (2.640625) and add it to both sides.

Add '2.640625' to each side of the equation.
-3.25x + 2.640625 + x2 = -1.25 + 2.640625

Reorder the terms:
2.640625 + -3.25x + x2 = -1.25 + 2.640625

Combine like terms: -1.25 + 2.640625 = 1.390625
2.640625 + -3.25x + x2 = 1.390625

Factor a perfect square on the left side:
(x + -1.625)(x + -1.625) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(x + -1.625) equal to 1.179247642 and -1.179247642.

Subproblem 1

x + -1.625 = 1.179247642 Simplifying x + -1.625 = 1.179247642 Reorder the terms: -1.625 + x = 1.179247642 Solving -1.625 + x = 1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.625' to each side of the equation. -1.625 + 1.625 + x = 1.179247642 + 1.625 Combine like terms: -1.625 + 1.625 = 0.000 0.000 + x = 1.179247642 + 1.625 x = 1.179247642 + 1.625 Combine like terms: 1.179247642 + 1.625 = 2.804247642 x = 2.804247642 Simplifying x = 2.804247642

Subproblem 2

x + -1.625 = -1.179247642 Simplifying x + -1.625 = -1.179247642 Reorder the terms: -1.625 + x = -1.179247642 Solving -1.625 + x = -1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.625' to each side of the equation. -1.625 + 1.625 + x = -1.179247642 + 1.625 Combine like terms: -1.625 + 1.625 = 0.000 0.000 + x = -1.179247642 + 1.625 x = -1.179247642 + 1.625 Combine like terms: -1.179247642 + 1.625 = 0.445752358 x = 0.445752358 Simplifying x = 0.445752358

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.804247642, 0.445752358}

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