(4x+1)(7x+3)=180

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Solution for (4x+1)(7x+3)=180 equation:


Simplifying
(4x + 1)(7x + 3) = 180

Reorder the terms:
(1 + 4x)(7x + 3) = 180

Reorder the terms:
(1 + 4x)(3 + 7x) = 180

Multiply (1 + 4x) * (3 + 7x)
(1(3 + 7x) + 4x * (3 + 7x)) = 180
((3 * 1 + 7x * 1) + 4x * (3 + 7x)) = 180
((3 + 7x) + 4x * (3 + 7x)) = 180
(3 + 7x + (3 * 4x + 7x * 4x)) = 180
(3 + 7x + (12x + 28x2)) = 180

Combine like terms: 7x + 12x = 19x
(3 + 19x + 28x2) = 180

Solving
3 + 19x + 28x2 = 180

Solving for variable 'x'.

Reorder the terms:
3 + -180 + 19x + 28x2 = 180 + -180

Combine like terms: 3 + -180 = -177
-177 + 19x + 28x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-177 + 19x + 28x2 = 0

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

Divide each side by '28'.
-6.321428571 + 0.6785714286x + x2 = 0

Move the constant term to the right:

Add '6.321428571' to each side of the equation.
-6.321428571 + 0.6785714286x + 6.321428571 + x2 = 0 + 6.321428571

Reorder the terms:
-6.321428571 + 6.321428571 + 0.6785714286x + x2 = 0 + 6.321428571

Combine like terms: -6.321428571 + 6.321428571 = 0.000000000
0.000000000 + 0.6785714286x + x2 = 0 + 6.321428571
0.6785714286x + x2 = 0 + 6.321428571

Combine like terms: 0 + 6.321428571 = 6.321428571
0.6785714286x + x2 = 6.321428571

The x term is 0.6785714286x.  Take half its coefficient (0.3392857143).
Square it (0.1151147959) and add it to both sides.

Add '0.1151147959' to each side of the equation.
0.6785714286x + 0.1151147959 + x2 = 6.321428571 + 0.1151147959

Reorder the terms:
0.1151147959 + 0.6785714286x + x2 = 6.321428571 + 0.1151147959

Combine like terms: 6.321428571 + 0.1151147959 = 6.4365433669
0.1151147959 + 0.6785714286x + x2 = 6.4365433669

Factor a perfect square on the left side:
(x + 0.3392857143)(x + 0.3392857143) = 6.4365433669

Calculate the square root of the right side: 2.537034365

Break this problem into two subproblems by setting 
(x + 0.3392857143) equal to 2.537034365 and -2.537034365.

Subproblem 1

x + 0.3392857143 = 2.537034365 Simplifying x + 0.3392857143 = 2.537034365 Reorder the terms: 0.3392857143 + x = 2.537034365 Solving 0.3392857143 + x = 2.537034365 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3392857143' to each side of the equation. 0.3392857143 + -0.3392857143 + x = 2.537034365 + -0.3392857143 Combine like terms: 0.3392857143 + -0.3392857143 = 0.0000000000 0.0000000000 + x = 2.537034365 + -0.3392857143 x = 2.537034365 + -0.3392857143 Combine like terms: 2.537034365 + -0.3392857143 = 2.1977486507 x = 2.1977486507 Simplifying x = 2.1977486507

Subproblem 2

x + 0.3392857143 = -2.537034365 Simplifying x + 0.3392857143 = -2.537034365 Reorder the terms: 0.3392857143 + x = -2.537034365 Solving 0.3392857143 + x = -2.537034365 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3392857143' to each side of the equation. 0.3392857143 + -0.3392857143 + x = -2.537034365 + -0.3392857143 Combine like terms: 0.3392857143 + -0.3392857143 = 0.0000000000 0.0000000000 + x = -2.537034365 + -0.3392857143 x = -2.537034365 + -0.3392857143 Combine like terms: -2.537034365 + -0.3392857143 = -2.8763200793 x = -2.8763200793 Simplifying x = -2.8763200793

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.1977486507, -2.8763200793}

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