-0.02x^2+.92x+4=.2x+7.6

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Solution for -0.02x^2+.92x+4=.2x+7.6 equation:


Simplifying
-0.02x2 + 0.92x + 4 = 0.2x + 7.6

Reorder the terms:
4 + 0.92x + -0.02x2 = 0.2x + 7.6

Reorder the terms:
4 + 0.92x + -0.02x2 = 7.6 + 0.2x

Solving
4 + 0.92x + -0.02x2 = 7.6 + 0.2x

Solving for variable 'x'.

Reorder the terms:
4 + -7.6 + 0.92x + -0.2x + -0.02x2 = 7.6 + 0.2x + -7.6 + -0.2x

Combine like terms: 4 + -7.6 = -3.6
-3.6 + 0.92x + -0.2x + -0.02x2 = 7.6 + 0.2x + -7.6 + -0.2x

Combine like terms: 0.92x + -0.2x = 0.72x
-3.6 + 0.72x + -0.02x2 = 7.6 + 0.2x + -7.6 + -0.2x

Reorder the terms:
-3.6 + 0.72x + -0.02x2 = 7.6 + -7.6 + 0.2x + -0.2x

Combine like terms: 7.6 + -7.6 = 0.0
-3.6 + 0.72x + -0.02x2 = 0.0 + 0.2x + -0.2x
-3.6 + 0.72x + -0.02x2 = 0.2x + -0.2x

Combine like terms: 0.2x + -0.2x = 0.0
-3.6 + 0.72x + -0.02x2 = 0.0

Begin completing the square.  Divide all terms by
-0.02 the coefficient of the squared term: 

Divide each side by '-0.02'.
180 + -36x + x2 = 0

Move the constant term to the right:

Add '-180' to each side of the equation.
180 + -36x + -180 + x2 = 0 + -180

Reorder the terms:
180 + -180 + -36x + x2 = 0 + -180

Combine like terms: 180 + -180 = 0
0 + -36x + x2 = 0 + -180
-36x + x2 = 0 + -180

Combine like terms: 0 + -180 = -180
-36x + x2 = -180

The x term is -36x.  Take half its coefficient (-18).
Square it (324) and add it to both sides.

Add '324' to each side of the equation.
-36x + 324 + x2 = -180 + 324

Reorder the terms:
324 + -36x + x2 = -180 + 324

Combine like terms: -180 + 324 = 144
324 + -36x + x2 = 144

Factor a perfect square on the left side:
(x + -18)(x + -18) = 144

Calculate the square root of the right side: 12

Break this problem into two subproblems by setting 
(x + -18) equal to 12 and -12.

Subproblem 1

x + -18 = 12 Simplifying x + -18 = 12 Reorder the terms: -18 + x = 12 Solving -18 + x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + x = 12 + 18 Combine like terms: -18 + 18 = 0 0 + x = 12 + 18 x = 12 + 18 Combine like terms: 12 + 18 = 30 x = 30 Simplifying x = 30

Subproblem 2

x + -18 = -12 Simplifying x + -18 = -12 Reorder the terms: -18 + x = -12 Solving -18 + x = -12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + x = -12 + 18 Combine like terms: -18 + 18 = 0 0 + x = -12 + 18 x = -12 + 18 Combine like terms: -12 + 18 = 6 x = 6 Simplifying x = 6

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30, 6}

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