-5*x+350=.1x^2-x-5

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Solution for -5*x+350=.1x^2-x-5 equation:


Simplifying
-5x + 350 = 0.1x2 + -1x + -5

Reorder the terms:
350 + -5x = 0.1x2 + -1x + -5

Reorder the terms:
350 + -5x = -5 + -1x + 0.1x2

Solving
350 + -5x = -5 + -1x + 0.1x2

Solving for variable 'x'.

Reorder the terms:
350 + 5 + -5x + x + -0.1x2 = -5 + -1x + 0.1x2 + 5 + x + -0.1x2

Combine like terms: 350 + 5 = 355
355 + -5x + x + -0.1x2 = -5 + -1x + 0.1x2 + 5 + x + -0.1x2

Combine like terms: -5x + x = -4x
355 + -4x + -0.1x2 = -5 + -1x + 0.1x2 + 5 + x + -0.1x2

Reorder the terms:
355 + -4x + -0.1x2 = -5 + 5 + -1x + x + 0.1x2 + -0.1x2

Combine like terms: -5 + 5 = 0
355 + -4x + -0.1x2 = 0 + -1x + x + 0.1x2 + -0.1x2
355 + -4x + -0.1x2 = -1x + x + 0.1x2 + -0.1x2

Combine like terms: -1x + x = 0
355 + -4x + -0.1x2 = 0 + 0.1x2 + -0.1x2
355 + -4x + -0.1x2 = 0.1x2 + -0.1x2

Combine like terms: 0.1x2 + -0.1x2 = 0.0
355 + -4x + -0.1x2 = 0.0

Begin completing the square.  Divide all terms by
-0.1 the coefficient of the squared term: 

Divide each side by '-0.1'.
-3550 + 40x + x2 = 0

Move the constant term to the right:

Add '3550' to each side of the equation.
-3550 + 40x + 3550 + x2 = 0 + 3550

Reorder the terms:
-3550 + 3550 + 40x + x2 = 0 + 3550

Combine like terms: -3550 + 3550 = 0
0 + 40x + x2 = 0 + 3550
40x + x2 = 0 + 3550

Combine like terms: 0 + 3550 = 3550
40x + x2 = 3550

The x term is 40x.  Take half its coefficient (20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
40x + 400 + x2 = 3550 + 400

Reorder the terms:
400 + 40x + x2 = 3550 + 400

Combine like terms: 3550 + 400 = 3950
400 + 40x + x2 = 3950

Factor a perfect square on the left side:
(x + 20)(x + 20) = 3950

Calculate the square root of the right side: 62.84902545

Break this problem into two subproblems by setting 
(x + 20) equal to 62.84902545 and -62.84902545.

Subproblem 1

x + 20 = 62.84902545 Simplifying x + 20 = 62.84902545 Reorder the terms: 20 + x = 62.84902545 Solving 20 + x = 62.84902545 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = 62.84902545 + -20 Combine like terms: 20 + -20 = 0 0 + x = 62.84902545 + -20 x = 62.84902545 + -20 Combine like terms: 62.84902545 + -20 = 42.84902545 x = 42.84902545 Simplifying x = 42.84902545

Subproblem 2

x + 20 = -62.84902545 Simplifying x + 20 = -62.84902545 Reorder the terms: 20 + x = -62.84902545 Solving 20 + x = -62.84902545 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = -62.84902545 + -20 Combine like terms: 20 + -20 = 0 0 + x = -62.84902545 + -20 x = -62.84902545 + -20 Combine like terms: -62.84902545 + -20 = -82.84902545 x = -82.84902545 Simplifying x = -82.84902545

Solution

The solution to the problem is based on the solutions from the subproblems. x = {42.84902545, -82.84902545}

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