(x-2)(28-7x)=3

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Solution for (x-2)(28-7x)=3 equation:


Simplifying
(x + -2)(28 + -7x) = 3

Reorder the terms:
(-2 + x)(28 + -7x) = 3

Multiply (-2 + x) * (28 + -7x)
(-2(28 + -7x) + x(28 + -7x)) = 3
((28 * -2 + -7x * -2) + x(28 + -7x)) = 3
((-56 + 14x) + x(28 + -7x)) = 3
(-56 + 14x + (28 * x + -7x * x)) = 3
(-56 + 14x + (28x + -7x2)) = 3

Combine like terms: 14x + 28x = 42x
(-56 + 42x + -7x2) = 3

Solving
-56 + 42x + -7x2 = 3

Solving for variable 'x'.

Reorder the terms:
-56 + -3 + 42x + -7x2 = 3 + -3

Combine like terms: -56 + -3 = -59
-59 + 42x + -7x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-59 + 42x + -7x2 = 0

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
8.428571429 + -6x + x2 = 0

Move the constant term to the right:

Add '-8.428571429' to each side of the equation.
8.428571429 + -6x + -8.428571429 + x2 = 0 + -8.428571429

Reorder the terms:
8.428571429 + -8.428571429 + -6x + x2 = 0 + -8.428571429

Combine like terms: 8.428571429 + -8.428571429 = 0.000000000
0.000000000 + -6x + x2 = 0 + -8.428571429
-6x + x2 = 0 + -8.428571429

Combine like terms: 0 + -8.428571429 = -8.428571429
-6x + x2 = -8.428571429

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = -8.428571429 + 9

Reorder the terms:
9 + -6x + x2 = -8.428571429 + 9

Combine like terms: -8.428571429 + 9 = 0.571428571
9 + -6x + x2 = 0.571428571

Factor a perfect square on the left side:
(x + -3)(x + -3) = 0.571428571

Calculate the square root of the right side: 0.755928946

Break this problem into two subproblems by setting 
(x + -3) equal to 0.755928946 and -0.755928946.

Subproblem 1

x + -3 = 0.755928946 Simplifying x + -3 = 0.755928946 Reorder the terms: -3 + x = 0.755928946 Solving -3 + x = 0.755928946 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 0.755928946 + 3 Combine like terms: -3 + 3 = 0 0 + x = 0.755928946 + 3 x = 0.755928946 + 3 Combine like terms: 0.755928946 + 3 = 3.755928946 x = 3.755928946 Simplifying x = 3.755928946

Subproblem 2

x + -3 = -0.755928946 Simplifying x + -3 = -0.755928946 Reorder the terms: -3 + x = -0.755928946 Solving -3 + x = -0.755928946 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -0.755928946 + 3 Combine like terms: -3 + 3 = 0 0 + x = -0.755928946 + 3 x = -0.755928946 + 3 Combine like terms: -0.755928946 + 3 = 2.244071054 x = 2.244071054 Simplifying x = 2.244071054

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.755928946, 2.244071054}

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