x^2-.9x-5.2=0

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Solution for x^2-.9x-5.2=0 equation:


Simplifying
x2 + -0.9x + -5.2 = 0

Reorder the terms:
-5.2 + -0.9x + x2 = 0

Solving
-5.2 + -0.9x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '5.2' to each side of the equation.
-5.2 + -0.9x + 5.2 + x2 = 0 + 5.2

Reorder the terms:
-5.2 + 5.2 + -0.9x + x2 = 0 + 5.2

Combine like terms: -5.2 + 5.2 = 0.0
0.0 + -0.9x + x2 = 0 + 5.2
-0.9x + x2 = 0 + 5.2

Combine like terms: 0 + 5.2 = 5.2
-0.9x + x2 = 5.2

The x term is -0.9x.  Take half its coefficient (-0.45).
Square it (0.2025) and add it to both sides.

Add '0.2025' to each side of the equation.
-0.9x + 0.2025 + x2 = 5.2 + 0.2025

Reorder the terms:
0.2025 + -0.9x + x2 = 5.2 + 0.2025

Combine like terms: 5.2 + 0.2025 = 5.4025
0.2025 + -0.9x + x2 = 5.4025

Factor a perfect square on the left side:
(x + -0.45)(x + -0.45) = 5.4025

Calculate the square root of the right side: 2.32432786

Break this problem into two subproblems by setting 
(x + -0.45) equal to 2.32432786 and -2.32432786.

Subproblem 1

x + -0.45 = 2.32432786 Simplifying x + -0.45 = 2.32432786 Reorder the terms: -0.45 + x = 2.32432786 Solving -0.45 + x = 2.32432786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.45' to each side of the equation. -0.45 + 0.45 + x = 2.32432786 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + x = 2.32432786 + 0.45 x = 2.32432786 + 0.45 Combine like terms: 2.32432786 + 0.45 = 2.77432786 x = 2.77432786 Simplifying x = 2.77432786

Subproblem 2

x + -0.45 = -2.32432786 Simplifying x + -0.45 = -2.32432786 Reorder the terms: -0.45 + x = -2.32432786 Solving -0.45 + x = -2.32432786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.45' to each side of the equation. -0.45 + 0.45 + x = -2.32432786 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + x = -2.32432786 + 0.45 x = -2.32432786 + 0.45 Combine like terms: -2.32432786 + 0.45 = -1.87432786 x = -1.87432786 Simplifying x = -1.87432786

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.77432786, -1.87432786}

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