10-3x(x+6)=7x-6

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Solution for 10-3x(x+6)=7x-6 equation:


Simplifying
10 + -3x(x + 6) = 7x + -6

Reorder the terms:
10 + -3x(6 + x) = 7x + -6
10 + (6 * -3x + x * -3x) = 7x + -6
10 + (-18x + -3x2) = 7x + -6

Reorder the terms:
10 + -18x + -3x2 = -6 + 7x

Solving
10 + -18x + -3x2 = -6 + 7x

Solving for variable 'x'.

Reorder the terms:
10 + 6 + -18x + -7x + -3x2 = -6 + 7x + 6 + -7x

Combine like terms: 10 + 6 = 16
16 + -18x + -7x + -3x2 = -6 + 7x + 6 + -7x

Combine like terms: -18x + -7x = -25x
16 + -25x + -3x2 = -6 + 7x + 6 + -7x

Reorder the terms:
16 + -25x + -3x2 = -6 + 6 + 7x + -7x

Combine like terms: -6 + 6 = 0
16 + -25x + -3x2 = 0 + 7x + -7x
16 + -25x + -3x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
16 + -25x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-5.333333333 + 8.333333333x + x2 = 0

Move the constant term to the right:

Add '5.333333333' to each side of the equation.
-5.333333333 + 8.333333333x + 5.333333333 + x2 = 0 + 5.333333333

Reorder the terms:
-5.333333333 + 5.333333333 + 8.333333333x + x2 = 0 + 5.333333333

Combine like terms: -5.333333333 + 5.333333333 = 0.000000000
0.000000000 + 8.333333333x + x2 = 0 + 5.333333333
8.333333333x + x2 = 0 + 5.333333333

Combine like terms: 0 + 5.333333333 = 5.333333333
8.333333333x + x2 = 5.333333333

The x term is 8.333333333x.  Take half its coefficient (4.166666667).
Square it (17.36111111) and add it to both sides.

Add '17.36111111' to each side of the equation.
8.333333333x + 17.36111111 + x2 = 5.333333333 + 17.36111111

Reorder the terms:
17.36111111 + 8.333333333x + x2 = 5.333333333 + 17.36111111

Combine like terms: 5.333333333 + 17.36111111 = 22.694444443
17.36111111 + 8.333333333x + x2 = 22.694444443

Factor a perfect square on the left side:
(x + 4.166666667)(x + 4.166666667) = 22.694444443

Calculate the square root of the right side: 4.763868643

Break this problem into two subproblems by setting 
(x + 4.166666667) equal to 4.763868643 and -4.763868643.

Subproblem 1

x + 4.166666667 = 4.763868643 Simplifying x + 4.166666667 = 4.763868643 Reorder the terms: 4.166666667 + x = 4.763868643 Solving 4.166666667 + x = 4.763868643 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.166666667' to each side of the equation. 4.166666667 + -4.166666667 + x = 4.763868643 + -4.166666667 Combine like terms: 4.166666667 + -4.166666667 = 0.000000000 0.000000000 + x = 4.763868643 + -4.166666667 x = 4.763868643 + -4.166666667 Combine like terms: 4.763868643 + -4.166666667 = 0.597201976 x = 0.597201976 Simplifying x = 0.597201976

Subproblem 2

x + 4.166666667 = -4.763868643 Simplifying x + 4.166666667 = -4.763868643 Reorder the terms: 4.166666667 + x = -4.763868643 Solving 4.166666667 + x = -4.763868643 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.166666667' to each side of the equation. 4.166666667 + -4.166666667 + x = -4.763868643 + -4.166666667 Combine like terms: 4.166666667 + -4.166666667 = 0.000000000 0.000000000 + x = -4.763868643 + -4.166666667 x = -4.763868643 + -4.166666667 Combine like terms: -4.763868643 + -4.166666667 = -8.93053531 x = -8.93053531 Simplifying x = -8.93053531

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.597201976, -8.93053531}

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