(x^2)=1.8(0.3-x)

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Solution for (x^2)=1.8(0.3-x) equation:


Simplifying
(x2) = 1.8(0.3 + -1x)
x2 = 1.8(0.3 + -1x)
x2 = (0.3 * 1.8 + -1x * 1.8)
x2 = (0.54 + -1.8x)

Solving
x2 = 0.54 + -1.8x

Solving for variable 'x'.

Reorder the terms:
-0.54 + 1.8x + x2 = 0.54 + -1.8x + -0.54 + 1.8x

Reorder the terms:
-0.54 + 1.8x + x2 = 0.54 + -0.54 + -1.8x + 1.8x

Combine like terms: 0.54 + -0.54 = 0.00
-0.54 + 1.8x + x2 = 0.00 + -1.8x + 1.8x
-0.54 + 1.8x + x2 = -1.8x + 1.8x

Combine like terms: -1.8x + 1.8x = 0.0
-0.54 + 1.8x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '0.54' to each side of the equation.
-0.54 + 1.8x + 0.54 + x2 = 0.0 + 0.54

Reorder the terms:
-0.54 + 0.54 + 1.8x + x2 = 0.0 + 0.54

Combine like terms: -0.54 + 0.54 = 0.00
0.00 + 1.8x + x2 = 0.0 + 0.54
1.8x + x2 = 0.0 + 0.54

Combine like terms: 0.0 + 0.54 = 0.54
1.8x + x2 = 0.54

The x term is 1.8x.  Take half its coefficient (0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
1.8x + 0.81 + x2 = 0.54 + 0.81

Reorder the terms:
0.81 + 1.8x + x2 = 0.54 + 0.81

Combine like terms: 0.54 + 0.81 = 1.35
0.81 + 1.8x + x2 = 1.35

Factor a perfect square on the left side:
(x + 0.9)(x + 0.9) = 1.35

Calculate the square root of the right side: 1.161895004

Break this problem into two subproblems by setting 
(x + 0.9) equal to 1.161895004 and -1.161895004.

Subproblem 1

x + 0.9 = 1.161895004 Simplifying x + 0.9 = 1.161895004 Reorder the terms: 0.9 + x = 1.161895004 Solving 0.9 + x = 1.161895004 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + x = 1.161895004 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + x = 1.161895004 + -0.9 x = 1.161895004 + -0.9 Combine like terms: 1.161895004 + -0.9 = 0.261895004 x = 0.261895004 Simplifying x = 0.261895004

Subproblem 2

x + 0.9 = -1.161895004 Simplifying x + 0.9 = -1.161895004 Reorder the terms: 0.9 + x = -1.161895004 Solving 0.9 + x = -1.161895004 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + x = -1.161895004 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + x = -1.161895004 + -0.9 x = -1.161895004 + -0.9 Combine like terms: -1.161895004 + -0.9 = -2.061895004 x = -2.061895004 Simplifying x = -2.061895004

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.261895004, -2.061895004}

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