4=-.01x^2-.1x+6

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Solution for 4=-.01x^2-.1x+6 equation:


Simplifying
4 = -0.01x2 + -0.1x + 6

Reorder the terms:
4 = 6 + -0.1x + -0.01x2

Solving
4 = 6 + -0.1x + -0.01x2

Solving for variable 'x'.

Combine like terms: 4 + -6 = -2
-2 + 0.1x + 0.01x2 = 6 + -0.1x + -0.01x2 + -6 + 0.1x + 0.01x2

Reorder the terms:
-2 + 0.1x + 0.01x2 = 6 + -6 + -0.1x + 0.1x + -0.01x2 + 0.01x2

Combine like terms: 6 + -6 = 0
-2 + 0.1x + 0.01x2 = 0 + -0.1x + 0.1x + -0.01x2 + 0.01x2
-2 + 0.1x + 0.01x2 = -0.1x + 0.1x + -0.01x2 + 0.01x2

Combine like terms: -0.1x + 0.1x = 0.0
-2 + 0.1x + 0.01x2 = 0.0 + -0.01x2 + 0.01x2
-2 + 0.1x + 0.01x2 = -0.01x2 + 0.01x2

Combine like terms: -0.01x2 + 0.01x2 = 0.00
-2 + 0.1x + 0.01x2 = 0.00

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

Divide each side by '0.01'.
-200 + 10x + x2 = 0

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + 10x + 200 + x2 = 0 + 200

Reorder the terms:
-200 + 200 + 10x + x2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + 10x + x2 = 0 + 200
10x + x2 = 0 + 200

Combine like terms: 0 + 200 = 200
10x + x2 = 200

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 = 200 + 25

Reorder the terms:
25 + 10x + x2 = 200 + 25

Combine like terms: 200 + 25 = 225
25 + 10x + x2 = 225

Factor a perfect square on the left side:
(x + 5)(x + 5) = 225

Calculate the square root of the right side: 15

Break this problem into two subproblems by setting 
(x + 5) equal to 15 and -15.

Subproblem 1

x + 5 = 15 Simplifying x + 5 = 15 Reorder the terms: 5 + x = 15 Solving 5 + x = 15 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 = 15 + -5 Combine like terms: 5 + -5 = 0 0 + x = 15 + -5 x = 15 + -5 Combine like terms: 15 + -5 = 10 x = 10 Simplifying x = 10

Subproblem 2

x + 5 = -15 Simplifying x + 5 = -15 Reorder the terms: 5 + x = -15 Solving 5 + x = -15 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 = -15 + -5 Combine like terms: 5 + -5 = 0 0 + x = -15 + -5 x = -15 + -5 Combine like terms: -15 + -5 = -20 x = -20 Simplifying x = -20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10, -20}

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