7x(4x+3)=5

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Solution for 7x(4x+3)=5 equation:


Simplifying
7x(4x + 3) = 5

Reorder the terms:
7x(3 + 4x) = 5
(3 * 7x + 4x * 7x) = 5
(21x + 28x2) = 5

Solving
21x + 28x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + 21x + 28x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 21x + 28x2 = 0

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

Divide each side by '28'.
-0.1785714286 + 0.75x + x2 = 0

Move the constant term to the right:

Add '0.1785714286' to each side of the equation.
-0.1785714286 + 0.75x + 0.1785714286 + x2 = 0 + 0.1785714286

Reorder the terms:
-0.1785714286 + 0.1785714286 + 0.75x + x2 = 0 + 0.1785714286

Combine like terms: -0.1785714286 + 0.1785714286 = 0.0000000000
0.0000000000 + 0.75x + x2 = 0 + 0.1785714286
0.75x + x2 = 0 + 0.1785714286

Combine like terms: 0 + 0.1785714286 = 0.1785714286
0.75x + x2 = 0.1785714286

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 = 0.1785714286 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 0.1785714286 + 0.140625

Combine like terms: 0.1785714286 + 0.140625 = 0.3191964286
0.140625 + 0.75x + x2 = 0.3191964286

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 0.3191964286

Calculate the square root of the right side: 0.564974715

Break this problem into two subproblems by setting 
(x + 0.375) equal to 0.564974715 and -0.564974715.

Subproblem 1

x + 0.375 = 0.564974715 Simplifying x + 0.375 = 0.564974715 Reorder the terms: 0.375 + x = 0.564974715 Solving 0.375 + x = 0.564974715 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 = 0.564974715 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 0.564974715 + -0.375 x = 0.564974715 + -0.375 Combine like terms: 0.564974715 + -0.375 = 0.189974715 x = 0.189974715 Simplifying x = 0.189974715

Subproblem 2

x + 0.375 = -0.564974715 Simplifying x + 0.375 = -0.564974715 Reorder the terms: 0.375 + x = -0.564974715 Solving 0.375 + x = -0.564974715 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 = -0.564974715 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -0.564974715 + -0.375 x = -0.564974715 + -0.375 Combine like terms: -0.564974715 + -0.375 = -0.939974715 x = -0.939974715 Simplifying x = -0.939974715

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.189974715, -0.939974715}

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