10=7x(x-18)

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Solution for 10=7x(x-18) equation:


Simplifying
10 = 7x(x + -18)

Reorder the terms:
10 = 7x(-18 + x)
10 = (-18 * 7x + x * 7x)
10 = (-126x + 7x2)

Solving
10 = -126x + 7x2

Solving for variable 'x'.

Reorder the terms:
10 + 126x + -7x2 = -126x + 126x + 7x2 + -7x2

Combine like terms: -126x + 126x = 0
10 + 126x + -7x2 = 0 + 7x2 + -7x2
10 + 126x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
10 + 126x + -7x2 = 0

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

Divide each side by '-7'.
-1.428571429 + -18x + x2 = 0

Move the constant term to the right:

Add '1.428571429' to each side of the equation.
-1.428571429 + -18x + 1.428571429 + x2 = 0 + 1.428571429

Reorder the terms:
-1.428571429 + 1.428571429 + -18x + x2 = 0 + 1.428571429

Combine like terms: -1.428571429 + 1.428571429 = 0.000000000
0.000000000 + -18x + x2 = 0 + 1.428571429
-18x + x2 = 0 + 1.428571429

Combine like terms: 0 + 1.428571429 = 1.428571429
-18x + x2 = 1.428571429

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = 1.428571429 + 81

Reorder the terms:
81 + -18x + x2 = 1.428571429 + 81

Combine like terms: 1.428571429 + 81 = 82.428571429
81 + -18x + x2 = 82.428571429

Factor a perfect square on the left side:
(x + -9)(x + -9) = 82.428571429

Calculate the square root of the right side: 9.079018197

Break this problem into two subproblems by setting 
(x + -9) equal to 9.079018197 and -9.079018197.

Subproblem 1

x + -9 = 9.079018197 Simplifying x + -9 = 9.079018197 Reorder the terms: -9 + x = 9.079018197 Solving -9 + x = 9.079018197 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 9.079018197 + 9 Combine like terms: -9 + 9 = 0 0 + x = 9.079018197 + 9 x = 9.079018197 + 9 Combine like terms: 9.079018197 + 9 = 18.079018197 x = 18.079018197 Simplifying x = 18.079018197

Subproblem 2

x + -9 = -9.079018197 Simplifying x + -9 = -9.079018197 Reorder the terms: -9 + x = -9.079018197 Solving -9 + x = -9.079018197 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -9.079018197 + 9 Combine like terms: -9 + 9 = 0 0 + x = -9.079018197 + 9 x = -9.079018197 + 9 Combine like terms: -9.079018197 + 9 = -0.079018197 x = -0.079018197 Simplifying x = -0.079018197

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.079018197, -0.079018197}

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