1.45=1+3x+3x^2

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Solution for 1.45=1+3x+3x^2 equation:


Simplifying
1.45 = 1 + 3x + 3x2

Solving
1.45 = 1 + 3x + 3x2

Solving for variable 'x'.

Combine like terms: 1.45 + -1 = 0.45
0.45 + -3x + -3x2 = 1 + 3x + 3x2 + -1 + -3x + -3x2

Reorder the terms:
0.45 + -3x + -3x2 = 1 + -1 + 3x + -3x + 3x2 + -3x2

Combine like terms: 1 + -1 = 0
0.45 + -3x + -3x2 = 0 + 3x + -3x + 3x2 + -3x2
0.45 + -3x + -3x2 = 3x + -3x + 3x2 + -3x2

Combine like terms: 3x + -3x = 0
0.45 + -3x + -3x2 = 0 + 3x2 + -3x2
0.45 + -3x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
0.45 + -3x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-0.15 + x + x2 = 0

Move the constant term to the right:

Add '0.15' to each side of the equation.
-0.15 + x + 0.15 + x2 = 0 + 0.15

Reorder the terms:
-0.15 + 0.15 + x + x2 = 0 + 0.15

Combine like terms: -0.15 + 0.15 = 0.00
0.00 + x + x2 = 0 + 0.15
x + x2 = 0 + 0.15

Combine like terms: 0 + 0.15 = 0.15
x + x2 = 0.15

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 0.15 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 0.15 + 0.25

Combine like terms: 0.15 + 0.25 = 0.4
1.25 + x2 = 0.4

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.4

Calculate the square root of the right side: 0.632455532

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.632455532 and -0.632455532.

Subproblem 1

x + 0.5 = 0.632455532 Simplifying x + 0.5 = 0.632455532 Reorder the terms: 0.5 + x = 0.632455532 Solving 0.5 + x = 0.632455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.632455532 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.632455532 + -0.5 x = 0.632455532 + -0.5 Combine like terms: 0.632455532 + -0.5 = 0.132455532 x = 0.132455532 Simplifying x = 0.132455532

Subproblem 2

x + 0.5 = -0.632455532 Simplifying x + 0.5 = -0.632455532 Reorder the terms: 0.5 + x = -0.632455532 Solving 0.5 + x = -0.632455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.632455532 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.632455532 + -0.5 x = -0.632455532 + -0.5 Combine like terms: -0.632455532 + -0.5 = -1.132455532 x = -1.132455532 Simplifying x = -1.132455532

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.132455532, -1.132455532}

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