9.6x+19.2=x^2+4x

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Solution for 9.6x+19.2=x^2+4x equation:


Simplifying
9.6x + 19.2 = x2 + 4x

Reorder the terms:
19.2 + 9.6x = x2 + 4x

Reorder the terms:
19.2 + 9.6x = 4x + x2

Solving
19.2 + 9.6x = 4x + x2

Solving for variable 'x'.

Combine like terms: 9.6x + -4x = 5.6x
19.2 + 5.6x + -1x2 = 4x + x2 + -4x + -1x2

Reorder the terms:
19.2 + 5.6x + -1x2 = 4x + -4x + x2 + -1x2

Combine like terms: 4x + -4x = 0
19.2 + 5.6x + -1x2 = 0 + x2 + -1x2
19.2 + 5.6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
19.2 + 5.6x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-19.2 + -5.6x + x2 = 0

Move the constant term to the right:

Add '19.2' to each side of the equation.
-19.2 + -5.6x + 19.2 + x2 = 0 + 19.2

Reorder the terms:
-19.2 + 19.2 + -5.6x + x2 = 0 + 19.2

Combine like terms: -19.2 + 19.2 = 0.0
0.0 + -5.6x + x2 = 0 + 19.2
-5.6x + x2 = 0 + 19.2

Combine like terms: 0 + 19.2 = 19.2
-5.6x + x2 = 19.2

The x term is -5.6x.  Take half its coefficient (-2.8).
Square it (7.84) and add it to both sides.

Add '7.84' to each side of the equation.
-5.6x + 7.84 + x2 = 19.2 + 7.84

Reorder the terms:
7.84 + -5.6x + x2 = 19.2 + 7.84

Combine like terms: 19.2 + 7.84 = 27.04
7.84 + -5.6x + x2 = 27.04

Factor a perfect square on the left side:
(x + -2.8)(x + -2.8) = 27.04

Calculate the square root of the right side: 5.2

Break this problem into two subproblems by setting 
(x + -2.8) equal to 5.2 and -5.2.

Subproblem 1

x + -2.8 = 5.2 Simplifying x + -2.8 = 5.2 Reorder the terms: -2.8 + x = 5.2 Solving -2.8 + x = 5.2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.8' to each side of the equation. -2.8 + 2.8 + x = 5.2 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + x = 5.2 + 2.8 x = 5.2 + 2.8 Combine like terms: 5.2 + 2.8 = 8 x = 8 Simplifying x = 8

Subproblem 2

x + -2.8 = -5.2 Simplifying x + -2.8 = -5.2 Reorder the terms: -2.8 + x = -5.2 Solving -2.8 + x = -5.2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.8' to each side of the equation. -2.8 + 2.8 + x = -5.2 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + x = -5.2 + 2.8 x = -5.2 + 2.8 Combine like terms: -5.2 + 2.8 = -2.4 x = -2.4 Simplifying x = -2.4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8, -2.4}

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