7x(10+x)=-58

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


Simplifying
7x(10 + x) = -58
(10 * 7x + x * 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 = 16.714285714
25 + 10x + x2 = 16.714285714

Factor a perfect square on the left side:
(x + 5)(x + 5) = 16.714285714

Calculate the square root of the right side: 4.088310863

Break this problem into two subproblems by setting 
(x + 5) equal to 4.088310863 and -4.088310863.

Subproblem 1

x + 5 = 4.088310863 Simplifying x + 5 = 4.088310863 Reorder the terms: 5 + x = 4.088310863 Solving 5 + x = 4.088310863 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 = 4.088310863 + -5 Combine like terms: 5 + -5 = 0 0 + x = 4.088310863 + -5 x = 4.088310863 + -5 Combine like terms: 4.088310863 + -5 = -0.911689137 x = -0.911689137 Simplifying x = -0.911689137

Subproblem 2

x + 5 = -4.088310863 Simplifying x + 5 = -4.088310863 Reorder the terms: 5 + x = -4.088310863 Solving 5 + x = -4.088310863 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 = -4.088310863 + -5 Combine like terms: 5 + -5 = 0 0 + x = -4.088310863 + -5 x = -4.088310863 + -5 Combine like terms: -4.088310863 + -5 = -9.088310863 x = -9.088310863 Simplifying x = -9.088310863

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.911689137, -9.088310863}

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