x^2-.84x+.042=0

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Solution for x^2-.84x+.042=0 equation:


Simplifying
x2 + -0.84x + 0.042 = 0

Reorder the terms:
0.042 + -0.84x + x2 = 0

Solving
0.042 + -0.84x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-0.042' to each side of the equation.
0.042 + -0.84x + -0.042 + x2 = 0 + -0.042

Reorder the terms:
0.042 + -0.042 + -0.84x + x2 = 0 + -0.042

Combine like terms: 0.042 + -0.042 = 0.000
0.000 + -0.84x + x2 = 0 + -0.042
-0.84x + x2 = 0 + -0.042

Combine like terms: 0 + -0.042 = -0.042
-0.84x + x2 = -0.042

The x term is -0.84x.  Take half its coefficient (-0.42).
Square it (0.1764) and add it to both sides.

Add '0.1764' to each side of the equation.
-0.84x + 0.1764 + x2 = -0.042 + 0.1764

Reorder the terms:
0.1764 + -0.84x + x2 = -0.042 + 0.1764

Combine like terms: -0.042 + 0.1764 = 0.1344
0.1764 + -0.84x + x2 = 0.1344

Factor a perfect square on the left side:
(x + -0.42)(x + -0.42) = 0.1344

Calculate the square root of the right side: 0.366606056

Break this problem into two subproblems by setting 
(x + -0.42) equal to 0.366606056 and -0.366606056.

Subproblem 1

x + -0.42 = 0.366606056 Simplifying x + -0.42 = 0.366606056 Reorder the terms: -0.42 + x = 0.366606056 Solving -0.42 + x = 0.366606056 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.42' to each side of the equation. -0.42 + 0.42 + x = 0.366606056 + 0.42 Combine like terms: -0.42 + 0.42 = 0.00 0.00 + x = 0.366606056 + 0.42 x = 0.366606056 + 0.42 Combine like terms: 0.366606056 + 0.42 = 0.786606056 x = 0.786606056 Simplifying x = 0.786606056

Subproblem 2

x + -0.42 = -0.366606056 Simplifying x + -0.42 = -0.366606056 Reorder the terms: -0.42 + x = -0.366606056 Solving -0.42 + x = -0.366606056 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.42' to each side of the equation. -0.42 + 0.42 + x = -0.366606056 + 0.42 Combine like terms: -0.42 + 0.42 = 0.00 0.00 + x = -0.366606056 + 0.42 x = -0.366606056 + 0.42 Combine like terms: -0.366606056 + 0.42 = 0.053393944 x = 0.053393944 Simplifying x = 0.053393944

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.786606056, 0.053393944}

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