7x(3x+5)-8=.5(8x+20)-7x+5

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Solution for 7x(3x+5)-8=.5(8x+20)-7x+5 equation:


Simplifying
7x(3x + 5) + -8 = 0.5(8x + 20) + -7x + 5

Reorder the terms:
7x(5 + 3x) + -8 = 0.5(8x + 20) + -7x + 5
(5 * 7x + 3x * 7x) + -8 = 0.5(8x + 20) + -7x + 5
(35x + 21x2) + -8 = 0.5(8x + 20) + -7x + 5

Reorder the terms:
-8 + 35x + 21x2 = 0.5(8x + 20) + -7x + 5

Reorder the terms:
-8 + 35x + 21x2 = 0.5(20 + 8x) + -7x + 5
-8 + 35x + 21x2 = (20 * 0.5 + 8x * 0.5) + -7x + 5
-8 + 35x + 21x2 = (10 + 4x) + -7x + 5

Reorder the terms:
-8 + 35x + 21x2 = 10 + 5 + 4x + -7x

Combine like terms: 10 + 5 = 15
-8 + 35x + 21x2 = 15 + 4x + -7x

Combine like terms: 4x + -7x = -3x
-8 + 35x + 21x2 = 15 + -3x

Solving
-8 + 35x + 21x2 = 15 + -3x

Solving for variable 'x'.

Reorder the terms:
-8 + -15 + 35x + 3x + 21x2 = 15 + -3x + -15 + 3x

Combine like terms: -8 + -15 = -23
-23 + 35x + 3x + 21x2 = 15 + -3x + -15 + 3x

Combine like terms: 35x + 3x = 38x
-23 + 38x + 21x2 = 15 + -3x + -15 + 3x

Reorder the terms:
-23 + 38x + 21x2 = 15 + -15 + -3x + 3x

Combine like terms: 15 + -15 = 0
-23 + 38x + 21x2 = 0 + -3x + 3x
-23 + 38x + 21x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-23 + 38x + 21x2 = 0

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

Divide each side by '21'.
-1.095238095 + 1.80952381x + x2 = 0

Move the constant term to the right:

Add '1.095238095' to each side of the equation.
-1.095238095 + 1.80952381x + 1.095238095 + x2 = 0 + 1.095238095

Reorder the terms:
-1.095238095 + 1.095238095 + 1.80952381x + x2 = 0 + 1.095238095

Combine like terms: -1.095238095 + 1.095238095 = 0.000000000
0.000000000 + 1.80952381x + x2 = 0 + 1.095238095
1.80952381x + x2 = 0 + 1.095238095

Combine like terms: 0 + 1.095238095 = 1.095238095
1.80952381x + x2 = 1.095238095

The x term is 1.80952381x.  Take half its coefficient (0.904761905).
Square it (0.8185941047) and add it to both sides.

Add '0.8185941047' to each side of the equation.
1.80952381x + 0.8185941047 + x2 = 1.095238095 + 0.8185941047

Reorder the terms:
0.8185941047 + 1.80952381x + x2 = 1.095238095 + 0.8185941047

Combine like terms: 1.095238095 + 0.8185941047 = 1.9138321997
0.8185941047 + 1.80952381x + x2 = 1.9138321997

Factor a perfect square on the left side:
(x + 0.904761905)(x + 0.904761905) = 1.9138321997

Calculate the square root of the right side: 1.383413243

Break this problem into two subproblems by setting 
(x + 0.904761905) equal to 1.383413243 and -1.383413243.

Subproblem 1

x + 0.904761905 = 1.383413243 Simplifying x + 0.904761905 = 1.383413243 Reorder the terms: 0.904761905 + x = 1.383413243 Solving 0.904761905 + x = 1.383413243 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.904761905' to each side of the equation. 0.904761905 + -0.904761905 + x = 1.383413243 + -0.904761905 Combine like terms: 0.904761905 + -0.904761905 = 0.000000000 0.000000000 + x = 1.383413243 + -0.904761905 x = 1.383413243 + -0.904761905 Combine like terms: 1.383413243 + -0.904761905 = 0.478651338 x = 0.478651338 Simplifying x = 0.478651338

Subproblem 2

x + 0.904761905 = -1.383413243 Simplifying x + 0.904761905 = -1.383413243 Reorder the terms: 0.904761905 + x = -1.383413243 Solving 0.904761905 + x = -1.383413243 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.904761905' to each side of the equation. 0.904761905 + -0.904761905 + x = -1.383413243 + -0.904761905 Combine like terms: 0.904761905 + -0.904761905 = 0.000000000 0.000000000 + x = -1.383413243 + -0.904761905 x = -1.383413243 + -0.904761905 Combine like terms: -1.383413243 + -0.904761905 = -2.288175148 x = -2.288175148 Simplifying x = -2.288175148

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.478651338, -2.288175148}

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