x^2+2x(0.6)=0.45

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Solution for x^2+2x(0.6)=0.45 equation:


Simplifying
x2 + 2x(0.6) = 0.45

Reorder the terms for easier multiplication:
x2 + 2 * 0.6x = 0.45

Multiply 2 * 0.6
x2 + 1.2x = 0.45

Reorder the terms:
1.2x + x2 = 0.45

Solving
1.2x + x2 = 0.45

Solving for variable 'x'.

Reorder the terms:
-0.45 + 1.2x + x2 = 0.45 + -0.45

Combine like terms: 0.45 + -0.45 = 0.00
-0.45 + 1.2x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '0.45' to each side of the equation.
-0.45 + 1.2x + 0.45 + x2 = 0.00 + 0.45

Reorder the terms:
-0.45 + 0.45 + 1.2x + x2 = 0.00 + 0.45

Combine like terms: -0.45 + 0.45 = 0.00
0.00 + 1.2x + x2 = 0.00 + 0.45
1.2x + x2 = 0.00 + 0.45

Combine like terms: 0.00 + 0.45 = 0.45
1.2x + x2 = 0.45

The x term is 1.2x.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2x + 0.36 + x2 = 0.45 + 0.36

Reorder the terms:
0.36 + 1.2x + x2 = 0.45 + 0.36

Combine like terms: 0.45 + 0.36 = 0.81
0.36 + 1.2x + x2 = 0.81

Factor a perfect square on the left side:
(x + 0.6)(x + 0.6) = 0.81

Calculate the square root of the right side: 0.9

Break this problem into two subproblems by setting 
(x + 0.6) equal to 0.9 and -0.9.

Subproblem 1

x + 0.6 = 0.9 Simplifying x + 0.6 = 0.9 Reorder the terms: 0.6 + x = 0.9 Solving 0.6 + x = 0.9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = 0.9 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = 0.9 + -0.6 x = 0.9 + -0.6 Combine like terms: 0.9 + -0.6 = 0.3 x = 0.3 Simplifying x = 0.3

Subproblem 2

x + 0.6 = -0.9 Simplifying x + 0.6 = -0.9 Reorder the terms: 0.6 + x = -0.9 Solving 0.6 + x = -0.9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = -0.9 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = -0.9 + -0.6 x = -0.9 + -0.6 Combine like terms: -0.9 + -0.6 = -1.5 x = -1.5 Simplifying x = -1.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3, -1.5}

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