x^2+0.03x-0.91=0

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Solution for x^2+0.03x-0.91=0 equation:


Simplifying
x2 + 0.03x + -0.91 = 0

Reorder the terms:
-0.91 + 0.03x + x2 = 0

Solving
-0.91 + 0.03x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.91' to each side of the equation.
-0.91 + 0.03x + 0.91 + x2 = 0 + 0.91

Reorder the terms:
-0.91 + 0.91 + 0.03x + x2 = 0 + 0.91

Combine like terms: -0.91 + 0.91 = 0.00
0.00 + 0.03x + x2 = 0 + 0.91
0.03x + x2 = 0 + 0.91

Combine like terms: 0 + 0.91 = 0.91
0.03x + x2 = 0.91

The x term is 0.03x.  Take half its coefficient (0.015).
Square it (0.000225) and add it to both sides.

Add '0.000225' to each side of the equation.
0.03x + 0.000225 + x2 = 0.91 + 0.000225

Reorder the terms:
0.000225 + 0.03x + x2 = 0.91 + 0.000225

Combine like terms: 0.91 + 0.000225 = 0.910225
0.000225 + 0.03x + x2 = 0.910225

Factor a perfect square on the left side:
(x + 0.015)(x + 0.015) = 0.910225

Calculate the square root of the right side: 0.954057126

Break this problem into two subproblems by setting 
(x + 0.015) equal to 0.954057126 and -0.954057126.

Subproblem 1

x + 0.015 = 0.954057126 Simplifying x + 0.015 = 0.954057126 Reorder the terms: 0.015 + x = 0.954057126 Solving 0.015 + x = 0.954057126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.015' to each side of the equation. 0.015 + -0.015 + x = 0.954057126 + -0.015 Combine like terms: 0.015 + -0.015 = 0.000 0.000 + x = 0.954057126 + -0.015 x = 0.954057126 + -0.015 Combine like terms: 0.954057126 + -0.015 = 0.939057126 x = 0.939057126 Simplifying x = 0.939057126

Subproblem 2

x + 0.015 = -0.954057126 Simplifying x + 0.015 = -0.954057126 Reorder the terms: 0.015 + x = -0.954057126 Solving 0.015 + x = -0.954057126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.015' to each side of the equation. 0.015 + -0.015 + x = -0.954057126 + -0.015 Combine like terms: 0.015 + -0.015 = 0.000 0.000 + x = -0.954057126 + -0.015 x = -0.954057126 + -0.015 Combine like terms: -0.954057126 + -0.015 = -0.969057126 x = -0.969057126 Simplifying x = -0.969057126

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.939057126, -0.969057126}

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