x^2+1.68x=.3

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Solution for x^2+1.68x=.3 equation:


Simplifying
x2 + 1.68x = 0.3

Reorder the terms:
1.68x + x2 = 0.3

Solving
1.68x + x2 = 0.3

Solving for variable 'x'.

Reorder the terms:
-0.3 + 1.68x + x2 = 0.3 + -0.3

Combine like terms: 0.3 + -0.3 = 0.0
-0.3 + 1.68x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '0.3' to each side of the equation.
-0.3 + 1.68x + 0.3 + x2 = 0.0 + 0.3

Reorder the terms:
-0.3 + 0.3 + 1.68x + x2 = 0.0 + 0.3

Combine like terms: -0.3 + 0.3 = 0.0
0.0 + 1.68x + x2 = 0.0 + 0.3
1.68x + x2 = 0.0 + 0.3

Combine like terms: 0.0 + 0.3 = 0.3
1.68x + x2 = 0.3

The x term is 1.68x.  Take half its coefficient (0.84).
Square it (0.7056) and add it to both sides.

Add '0.7056' to each side of the equation.
1.68x + 0.7056 + x2 = 0.3 + 0.7056

Reorder the terms:
0.7056 + 1.68x + x2 = 0.3 + 0.7056

Combine like terms: 0.3 + 0.7056 = 1.0056
0.7056 + 1.68x + x2 = 1.0056

Factor a perfect square on the left side:
(x + 0.84)(x + 0.84) = 1.0056

Calculate the square root of the right side: 1.002796091

Break this problem into two subproblems by setting 
(x + 0.84) equal to 1.002796091 and -1.002796091.

Subproblem 1

x + 0.84 = 1.002796091 Simplifying x + 0.84 = 1.002796091 Reorder the terms: 0.84 + x = 1.002796091 Solving 0.84 + x = 1.002796091 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.84' to each side of the equation. 0.84 + -0.84 + x = 1.002796091 + -0.84 Combine like terms: 0.84 + -0.84 = 0.00 0.00 + x = 1.002796091 + -0.84 x = 1.002796091 + -0.84 Combine like terms: 1.002796091 + -0.84 = 0.162796091 x = 0.162796091 Simplifying x = 0.162796091

Subproblem 2

x + 0.84 = -1.002796091 Simplifying x + 0.84 = -1.002796091 Reorder the terms: 0.84 + x = -1.002796091 Solving 0.84 + x = -1.002796091 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.84' to each side of the equation. 0.84 + -0.84 + x = -1.002796091 + -0.84 Combine like terms: 0.84 + -0.84 = 0.00 0.00 + x = -1.002796091 + -0.84 x = -1.002796091 + -0.84 Combine like terms: -1.002796091 + -0.84 = -1.842796091 x = -1.842796091 Simplifying x = -1.842796091

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.162796091, -1.842796091}

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