5x(4x+5)=3

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


Simplifying
5x(4x + 5) = 3

Reorder the terms:
5x(5 + 4x) = 3
(5 * 5x + 4x * 5x) = 3
(25x + 20x2) = 3

Solving
25x + 20x2 = 3

Solving for variable 'x'.

Reorder the terms:
-3 + 25x + 20x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-3 + 25x + 20x2 = 0

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

Divide each side by '20'.
-0.15 + 1.25x + x2 = 0.0

Move the constant term to the right:

Add '0.15' to each side of the equation.
-0.15 + 1.25x + 0.15 + x2 = 0.0 + 0.15

Reorder the terms:
-0.15 + 0.15 + 1.25x + x2 = 0.0 + 0.15

Combine like terms: -0.15 + 0.15 = 0.00
0.00 + 1.25x + x2 = 0.0 + 0.15
1.25x + x2 = 0.0 + 0.15

Combine like terms: 0.0 + 0.15 = 0.15
1.25x + x2 = 0.15

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 0.15 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 0.15 + 0.390625

Combine like terms: 0.15 + 0.390625 = 0.540625
0.390625 + 1.25x + x2 = 0.540625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 0.540625

Calculate the square root of the right side: 0.735272058

Break this problem into two subproblems by setting 
(x + 0.625) equal to 0.735272058 and -0.735272058.

Subproblem 1

x + 0.625 = 0.735272058 Simplifying x + 0.625 = 0.735272058 Reorder the terms: 0.625 + x = 0.735272058 Solving 0.625 + x = 0.735272058 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 0.735272058 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 0.735272058 + -0.625 x = 0.735272058 + -0.625 Combine like terms: 0.735272058 + -0.625 = 0.110272058 x = 0.110272058 Simplifying x = 0.110272058

Subproblem 2

x + 0.625 = -0.735272058 Simplifying x + 0.625 = -0.735272058 Reorder the terms: 0.625 + x = -0.735272058 Solving 0.625 + x = -0.735272058 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -0.735272058 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -0.735272058 + -0.625 x = -0.735272058 + -0.625 Combine like terms: -0.735272058 + -0.625 = -1.360272058 x = -1.360272058 Simplifying x = -1.360272058

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.110272058, -1.360272058}

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