3x^2+x=3.75

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Solution for 3x^2+x=3.75 equation:


Simplifying
3x2 + x = 3.75

Reorder the terms:
x + 3x2 = 3.75

Solving
x + 3x2 = 3.75

Solving for variable 'x'.

Reorder the terms:
-3.75 + x + 3x2 = 3.75 + -3.75

Combine like terms: 3.75 + -3.75 = 0.00
-3.75 + x + 3x2 = 0.00

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

Divide each side by '3'.
-1.25 + 0.3333333333x + x2 = 0.00

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 0.3333333333x + 1.25 + x2 = 0.00 + 1.25

Reorder the terms:
-1.25 + 1.25 + 0.3333333333x + x2 = 0.00 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 0.3333333333x + x2 = 0.00 + 1.25
0.3333333333x + x2 = 0.00 + 1.25

Combine like terms: 0.00 + 1.25 = 1.25
0.3333333333x + x2 = 1.25

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.
0.3333333333x + 0.25 + x2 = 1.25 + 0.25

Reorder the terms:
0.25 + 0.3333333333x + x2 = 1.25 + 0.25

Combine like terms: 1.25 + 0.25 = 1.5
0.25 + 0.3333333333x + x2 = 1.5

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1.5

Calculate the square root of the right side: 1.224744871

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.224744871 and -1.224744871.

Subproblem 1

x + 0.5 = 1.224744871 Simplifying x + 0.5 = 1.224744871 Reorder the terms: 0.5 + x = 1.224744871 Solving 0.5 + x = 1.224744871 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 = 1.224744871 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.224744871 + -0.5 x = 1.224744871 + -0.5 Combine like terms: 1.224744871 + -0.5 = 0.724744871 x = 0.724744871 Simplifying x = 0.724744871

Subproblem 2

x + 0.5 = -1.224744871 Simplifying x + 0.5 = -1.224744871 Reorder the terms: 0.5 + x = -1.224744871 Solving 0.5 + x = -1.224744871 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 = -1.224744871 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.224744871 + -0.5 x = -1.224744871 + -0.5 Combine like terms: -1.224744871 + -0.5 = -1.724744871 x = -1.724744871 Simplifying x = -1.724744871

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.724744871, -1.724744871}

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