(7x+3)(4x)=35

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Solution for (7x+3)(4x)=35 equation:


Simplifying
(7x + 3)(4x) = 35

Reorder the terms:
(3 + 7x)(4x) = 35

Remove parenthesis around (4x)
(3 + 7x) * 4x = 35

Reorder the terms for easier multiplication:
4x(3 + 7x) = 35
(3 * 4x + 7x * 4x) = 35
(12x + 28x2) = 35

Solving
12x + 28x2 = 35

Solving for variable 'x'.

Reorder the terms:
-35 + 12x + 28x2 = 35 + -35

Combine like terms: 35 + -35 = 0
-35 + 12x + 28x2 = 0

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

Divide each side by '28'.
-1.25 + 0.4285714286x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 0.4285714286x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 0.4285714286x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 0.4285714286x + x2 = 0 + 1.25
0.4285714286x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
0.4285714286x + x2 = 1.25

The x term is 0.4285714286x.  Take half its coefficient (0.2142857143).
Square it (0.04591836735) and add it to both sides.

Add '0.04591836735' to each side of the equation.
0.4285714286x + 0.04591836735 + x2 = 1.25 + 0.04591836735

Reorder the terms:
0.04591836735 + 0.4285714286x + x2 = 1.25 + 0.04591836735

Combine like terms: 1.25 + 0.04591836735 = 1.29591836735
0.04591836735 + 0.4285714286x + x2 = 1.29591836735

Factor a perfect square on the left side:
(x + 0.2142857143)(x + 0.2142857143) = 1.29591836735

Calculate the square root of the right side: 1.138384104

Break this problem into two subproblems by setting 
(x + 0.2142857143) equal to 1.138384104 and -1.138384104.

Subproblem 1

x + 0.2142857143 = 1.138384104 Simplifying x + 0.2142857143 = 1.138384104 Reorder the terms: 0.2142857143 + x = 1.138384104 Solving 0.2142857143 + x = 1.138384104 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2142857143' to each side of the equation. 0.2142857143 + -0.2142857143 + x = 1.138384104 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + x = 1.138384104 + -0.2142857143 x = 1.138384104 + -0.2142857143 Combine like terms: 1.138384104 + -0.2142857143 = 0.9240983897 x = 0.9240983897 Simplifying x = 0.9240983897

Subproblem 2

x + 0.2142857143 = -1.138384104 Simplifying x + 0.2142857143 = -1.138384104 Reorder the terms: 0.2142857143 + x = -1.138384104 Solving 0.2142857143 + x = -1.138384104 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2142857143' to each side of the equation. 0.2142857143 + -0.2142857143 + x = -1.138384104 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + x = -1.138384104 + -0.2142857143 x = -1.138384104 + -0.2142857143 Combine like terms: -1.138384104 + -0.2142857143 = -1.3526698183 x = -1.3526698183 Simplifying x = -1.3526698183

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.9240983897, -1.3526698183}

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