7x(5x+4)=6

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Solution for 7x(5x+4)=6 equation:


Simplifying
7x(5x + 4) = 6

Reorder the terms:
7x(4 + 5x) = 6
(4 * 7x + 5x * 7x) = 6
(28x + 35x2) = 6

Solving
28x + 35x2 = 6

Solving for variable 'x'.

Reorder the terms:
-6 + 28x + 35x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-6 + 28x + 35x2 = 0

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

Divide each side by '35'.
-0.1714285714 + 0.8x + x2 = 0

Move the constant term to the right:

Add '0.1714285714' to each side of the equation.
-0.1714285714 + 0.8x + 0.1714285714 + x2 = 0 + 0.1714285714

Reorder the terms:
-0.1714285714 + 0.1714285714 + 0.8x + x2 = 0 + 0.1714285714

Combine like terms: -0.1714285714 + 0.1714285714 = 0.0000000000
0.0000000000 + 0.8x + x2 = 0 + 0.1714285714
0.8x + x2 = 0 + 0.1714285714

Combine like terms: 0 + 0.1714285714 = 0.1714285714
0.8x + x2 = 0.1714285714

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 0.1714285714 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 0.1714285714 + 0.16

Combine like terms: 0.1714285714 + 0.16 = 0.3314285714
0.16 + 0.8x + x2 = 0.3314285714

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 0.3314285714

Calculate the square root of the right side: 0.575698334

Break this problem into two subproblems by setting 
(x + 0.4) equal to 0.575698334 and -0.575698334.

Subproblem 1

x + 0.4 = 0.575698334 Simplifying x + 0.4 = 0.575698334 Reorder the terms: 0.4 + x = 0.575698334 Solving 0.4 + x = 0.575698334 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 0.575698334 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 0.575698334 + -0.4 x = 0.575698334 + -0.4 Combine like terms: 0.575698334 + -0.4 = 0.175698334 x = 0.175698334 Simplifying x = 0.175698334

Subproblem 2

x + 0.4 = -0.575698334 Simplifying x + 0.4 = -0.575698334 Reorder the terms: 0.4 + x = -0.575698334 Solving 0.4 + x = -0.575698334 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -0.575698334 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -0.575698334 + -0.4 x = -0.575698334 + -0.4 Combine like terms: -0.575698334 + -0.4 = -0.975698334 x = -0.975698334 Simplifying x = -0.975698334

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.175698334, -0.975698334}

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