x(4x+3)=5

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Solution for x(4x+3)=5 equation:


Simplifying
x(4x + 3) = 5

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

Solving
3x + 4x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + 3x + 4x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 3x + 4x2 = 0

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

Divide each side by '4'.
-1.25 + 0.75x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 0.75x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 0.75x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 0.75x + x2 = 0 + 1.25
0.75x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
0.75x + x2 = 1.25

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 1.25 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 1.25 + 0.140625

Combine like terms: 1.25 + 0.140625 = 1.390625
0.140625 + 0.75x + x2 = 1.390625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(x + 0.375) equal to 1.179247642 and -1.179247642.

Subproblem 1

x + 0.375 = 1.179247642 Simplifying x + 0.375 = 1.179247642 Reorder the terms: 0.375 + x = 1.179247642 Solving 0.375 + x = 1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 1.179247642 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 1.179247642 + -0.375 x = 1.179247642 + -0.375 Combine like terms: 1.179247642 + -0.375 = 0.804247642 x = 0.804247642 Simplifying x = 0.804247642

Subproblem 2

x + 0.375 = -1.179247642 Simplifying x + 0.375 = -1.179247642 Reorder the terms: 0.375 + x = -1.179247642 Solving 0.375 + x = -1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -1.179247642 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -1.179247642 + -0.375 x = -1.179247642 + -0.375 Combine like terms: -1.179247642 + -0.375 = -1.554247642 x = -1.554247642 Simplifying x = -1.554247642

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.804247642, -1.554247642}

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