(3x+14)(2x-7)=100

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Solution for (3x+14)(2x-7)=100 equation:


Simplifying
(3x + 14)(2x + -7) = 100

Reorder the terms:
(14 + 3x)(2x + -7) = 100

Reorder the terms:
(14 + 3x)(-7 + 2x) = 100

Multiply (14 + 3x) * (-7 + 2x)
(14(-7 + 2x) + 3x * (-7 + 2x)) = 100
((-7 * 14 + 2x * 14) + 3x * (-7 + 2x)) = 100
((-98 + 28x) + 3x * (-7 + 2x)) = 100
(-98 + 28x + (-7 * 3x + 2x * 3x)) = 100
(-98 + 28x + (-21x + 6x2)) = 100

Combine like terms: 28x + -21x = 7x
(-98 + 7x + 6x2) = 100

Solving
-98 + 7x + 6x2 = 100

Solving for variable 'x'.

Reorder the terms:
-98 + -100 + 7x + 6x2 = 100 + -100

Combine like terms: -98 + -100 = -198
-198 + 7x + 6x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-198 + 7x + 6x2 = 0

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

Divide each side by '6'.
-33 + 1.166666667x + x2 = 0

Move the constant term to the right:

Add '33' to each side of the equation.
-33 + 1.166666667x + 33 + x2 = 0 + 33

Reorder the terms:
-33 + 33 + 1.166666667x + x2 = 0 + 33

Combine like terms: -33 + 33 = 0
0 + 1.166666667x + x2 = 0 + 33
1.166666667x + x2 = 0 + 33

Combine like terms: 0 + 33 = 33
1.166666667x + x2 = 33

The x term is 1.166666667x.  Take half its coefficient (0.5833333335).
Square it (0.3402777780) and add it to both sides.

Add '0.3402777780' to each side of the equation.
1.166666667x + 0.3402777780 + x2 = 33 + 0.3402777780

Reorder the terms:
0.3402777780 + 1.166666667x + x2 = 33 + 0.3402777780

Combine like terms: 33 + 0.3402777780 = 33.340277778
0.3402777780 + 1.166666667x + x2 = 33.340277778

Factor a perfect square on the left side:
(x + 0.5833333335)(x + 0.5833333335) = 33.340277778

Calculate the square root of the right side: 5.774104067

Break this problem into two subproblems by setting 
(x + 0.5833333335) equal to 5.774104067 and -5.774104067.

Subproblem 1

x + 0.5833333335 = 5.774104067 Simplifying x + 0.5833333335 = 5.774104067 Reorder the terms: 0.5833333335 + x = 5.774104067 Solving 0.5833333335 + x = 5.774104067 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5833333335' to each side of the equation. 0.5833333335 + -0.5833333335 + x = 5.774104067 + -0.5833333335 Combine like terms: 0.5833333335 + -0.5833333335 = 0.0000000000 0.0000000000 + x = 5.774104067 + -0.5833333335 x = 5.774104067 + -0.5833333335 Combine like terms: 5.774104067 + -0.5833333335 = 5.1907707335 x = 5.1907707335 Simplifying x = 5.1907707335

Subproblem 2

x + 0.5833333335 = -5.774104067 Simplifying x + 0.5833333335 = -5.774104067 Reorder the terms: 0.5833333335 + x = -5.774104067 Solving 0.5833333335 + x = -5.774104067 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5833333335' to each side of the equation. 0.5833333335 + -0.5833333335 + x = -5.774104067 + -0.5833333335 Combine like terms: 0.5833333335 + -0.5833333335 = 0.0000000000 0.0000000000 + x = -5.774104067 + -0.5833333335 x = -5.774104067 + -0.5833333335 Combine like terms: -5.774104067 + -0.5833333335 = -6.3574374005 x = -6.3574374005 Simplifying x = -6.3574374005

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.1907707335, -6.3574374005}

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