(4x-20)(x+7)+4x-20=23+5x

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Solution for (4x-20)(x+7)+4x-20=23+5x equation:


Simplifying
(4x + -20)(x + 7) + 4x + -20 = 23 + 5x

Reorder the terms:
(-20 + 4x)(x + 7) + 4x + -20 = 23 + 5x

Reorder the terms:
(-20 + 4x)(7 + x) + 4x + -20 = 23 + 5x

Multiply (-20 + 4x) * (7 + x)
(-20(7 + x) + 4x * (7 + x)) + 4x + -20 = 23 + 5x
((7 * -20 + x * -20) + 4x * (7 + x)) + 4x + -20 = 23 + 5x
((-140 + -20x) + 4x * (7 + x)) + 4x + -20 = 23 + 5x
(-140 + -20x + (7 * 4x + x * 4x)) + 4x + -20 = 23 + 5x
(-140 + -20x + (28x + 4x2)) + 4x + -20 = 23 + 5x

Combine like terms: -20x + 28x = 8x
(-140 + 8x + 4x2) + 4x + -20 = 23 + 5x

Reorder the terms:
-140 + -20 + 8x + 4x + 4x2 = 23 + 5x

Combine like terms: -140 + -20 = -160
-160 + 8x + 4x + 4x2 = 23 + 5x

Combine like terms: 8x + 4x = 12x
-160 + 12x + 4x2 = 23 + 5x

Solving
-160 + 12x + 4x2 = 23 + 5x

Solving for variable 'x'.

Reorder the terms:
-160 + -23 + 12x + -5x + 4x2 = 23 + 5x + -23 + -5x

Combine like terms: -160 + -23 = -183
-183 + 12x + -5x + 4x2 = 23 + 5x + -23 + -5x

Combine like terms: 12x + -5x = 7x
-183 + 7x + 4x2 = 23 + 5x + -23 + -5x

Reorder the terms:
-183 + 7x + 4x2 = 23 + -23 + 5x + -5x

Combine like terms: 23 + -23 = 0
-183 + 7x + 4x2 = 0 + 5x + -5x
-183 + 7x + 4x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-183 + 7x + 4x2 = 0

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

Divide each side by '4'.
-45.75 + 1.75x + x2 = 0

Move the constant term to the right:

Add '45.75' to each side of the equation.
-45.75 + 1.75x + 45.75 + x2 = 0 + 45.75

Reorder the terms:
-45.75 + 45.75 + 1.75x + x2 = 0 + 45.75

Combine like terms: -45.75 + 45.75 = 0.00
0.00 + 1.75x + x2 = 0 + 45.75
1.75x + x2 = 0 + 45.75

Combine like terms: 0 + 45.75 = 45.75
1.75x + x2 = 45.75

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = 45.75 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 45.75 + 0.765625

Combine like terms: 45.75 + 0.765625 = 46.515625
0.765625 + 1.75x + x2 = 46.515625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 46.515625

Calculate the square root of the right side: 6.820236433

Break this problem into two subproblems by setting 
(x + 0.875) equal to 6.820236433 and -6.820236433.

Subproblem 1

x + 0.875 = 6.820236433 Simplifying x + 0.875 = 6.820236433 Reorder the terms: 0.875 + x = 6.820236433 Solving 0.875 + x = 6.820236433 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 6.820236433 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 6.820236433 + -0.875 x = 6.820236433 + -0.875 Combine like terms: 6.820236433 + -0.875 = 5.945236433 x = 5.945236433 Simplifying x = 5.945236433

Subproblem 2

x + 0.875 = -6.820236433 Simplifying x + 0.875 = -6.820236433 Reorder the terms: 0.875 + x = -6.820236433 Solving 0.875 + x = -6.820236433 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -6.820236433 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -6.820236433 + -0.875 x = -6.820236433 + -0.875 Combine like terms: -6.820236433 + -0.875 = -7.695236433 x = -7.695236433 Simplifying x = -7.695236433

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.945236433, -7.695236433}

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