-7x(10-x)=58

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Solution for -7x(10-x)=58 equation:


Simplifying
-7x(10 + -1x) = 58
(10 * -7x + -1x * -7x) = 58
(-70x + 7x2) = 58

Solving
-70x + 7x2 = 58

Solving for variable 'x'.

Reorder the terms:
-58 + -70x + 7x2 = 58 + -58

Combine like terms: 58 + -58 = 0
-58 + -70x + 7x2 = 0

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

Divide each side by '7'.
-8.285714286 + -10x + x2 = 0

Move the constant term to the right:

Add '8.285714286' to each side of the equation.
-8.285714286 + -10x + 8.285714286 + x2 = 0 + 8.285714286

Reorder the terms:
-8.285714286 + 8.285714286 + -10x + x2 = 0 + 8.285714286

Combine like terms: -8.285714286 + 8.285714286 = 0.000000000
0.000000000 + -10x + x2 = 0 + 8.285714286
-10x + x2 = 0 + 8.285714286

Combine like terms: 0 + 8.285714286 = 8.285714286
-10x + x2 = 8.285714286

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 8.285714286 + 25

Reorder the terms:
25 + -10x + x2 = 8.285714286 + 25

Combine like terms: 8.285714286 + 25 = 33.285714286
25 + -10x + x2 = 33.285714286

Factor a perfect square on the left side:
(x + -5)(x + -5) = 33.285714286

Calculate the square root of the right side: 5.769377288

Break this problem into two subproblems by setting 
(x + -5) equal to 5.769377288 and -5.769377288.

Subproblem 1

x + -5 = 5.769377288 Simplifying x + -5 = 5.769377288 Reorder the terms: -5 + x = 5.769377288 Solving -5 + x = 5.769377288 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 5.769377288 + 5 Combine like terms: -5 + 5 = 0 0 + x = 5.769377288 + 5 x = 5.769377288 + 5 Combine like terms: 5.769377288 + 5 = 10.769377288 x = 10.769377288 Simplifying x = 10.769377288

Subproblem 2

x + -5 = -5.769377288 Simplifying x + -5 = -5.769377288 Reorder the terms: -5 + x = -5.769377288 Solving -5 + x = -5.769377288 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -5.769377288 + 5 Combine like terms: -5 + 5 = 0 0 + x = -5.769377288 + 5 x = -5.769377288 + 5 Combine like terms: -5.769377288 + 5 = -0.769377288 x = -0.769377288 Simplifying x = -0.769377288

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.769377288, -0.769377288}

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