7x+5=10x(x-7)-3

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Solution for 7x+5=10x(x-7)-3 equation:


Simplifying
7x + 5 = 10x(x + -7) + -3

Reorder the terms:
5 + 7x = 10x(x + -7) + -3

Reorder the terms:
5 + 7x = 10x(-7 + x) + -3
5 + 7x = (-7 * 10x + x * 10x) + -3
5 + 7x = (-70x + 10x2) + -3

Reorder the terms:
5 + 7x = -3 + -70x + 10x2

Solving
5 + 7x = -3 + -70x + 10x2

Solving for variable 'x'.

Reorder the terms:
5 + 3 + 7x + 70x + -10x2 = -3 + -70x + 10x2 + 3 + 70x + -10x2

Combine like terms: 5 + 3 = 8
8 + 7x + 70x + -10x2 = -3 + -70x + 10x2 + 3 + 70x + -10x2

Combine like terms: 7x + 70x = 77x
8 + 77x + -10x2 = -3 + -70x + 10x2 + 3 + 70x + -10x2

Reorder the terms:
8 + 77x + -10x2 = -3 + 3 + -70x + 70x + 10x2 + -10x2

Combine like terms: -3 + 3 = 0
8 + 77x + -10x2 = 0 + -70x + 70x + 10x2 + -10x2
8 + 77x + -10x2 = -70x + 70x + 10x2 + -10x2

Combine like terms: -70x + 70x = 0
8 + 77x + -10x2 = 0 + 10x2 + -10x2
8 + 77x + -10x2 = 10x2 + -10x2

Combine like terms: 10x2 + -10x2 = 0
8 + 77x + -10x2 = 0

Begin completing the square.  Divide all terms by
-10 the coefficient of the squared term: 

Divide each side by '-10'.
-0.8 + -7.7x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -7.7x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -7.7x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -7.7x + x2 = 0 + 0.8
-7.7x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-7.7x + x2 = 0.8

The x term is -7.7x.  Take half its coefficient (-3.85).
Square it (14.8225) and add it to both sides.

Add '14.8225' to each side of the equation.
-7.7x + 14.8225 + x2 = 0.8 + 14.8225

Reorder the terms:
14.8225 + -7.7x + x2 = 0.8 + 14.8225

Combine like terms: 0.8 + 14.8225 = 15.6225
14.8225 + -7.7x + x2 = 15.6225

Factor a perfect square on the left side:
(x + -3.85)(x + -3.85) = 15.6225

Calculate the square root of the right side: 3.952530835

Break this problem into two subproblems by setting 
(x + -3.85) equal to 3.952530835 and -3.952530835.

Subproblem 1

x + -3.85 = 3.952530835 Simplifying x + -3.85 = 3.952530835 Reorder the terms: -3.85 + x = 3.952530835 Solving -3.85 + x = 3.952530835 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.85' to each side of the equation. -3.85 + 3.85 + x = 3.952530835 + 3.85 Combine like terms: -3.85 + 3.85 = 0.00 0.00 + x = 3.952530835 + 3.85 x = 3.952530835 + 3.85 Combine like terms: 3.952530835 + 3.85 = 7.802530835 x = 7.802530835 Simplifying x = 7.802530835

Subproblem 2

x + -3.85 = -3.952530835 Simplifying x + -3.85 = -3.952530835 Reorder the terms: -3.85 + x = -3.952530835 Solving -3.85 + x = -3.952530835 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.85' to each side of the equation. -3.85 + 3.85 + x = -3.952530835 + 3.85 Combine like terms: -3.85 + 3.85 = 0.00 0.00 + x = -3.952530835 + 3.85 x = -3.952530835 + 3.85 Combine like terms: -3.952530835 + 3.85 = -0.102530835 x = -0.102530835 Simplifying x = -0.102530835

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.802530835, -0.102530835}

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