X^2+2X-.3=0

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Solution for X^2+2X-.3=0 equation:


Simplifying
X2 + 2X + -0.3 = 0

Reorder the terms:
-0.3 + 2X + X2 = 0

Solving
-0.3 + 2X + X2 = 0

Solving for variable 'X'.

Begin completing the square.

Move the constant term to the right:

Add '0.3' to each side of the equation.
-0.3 + 2X + 0.3 + X2 = 0 + 0.3

Reorder the terms:
-0.3 + 0.3 + 2X + X2 = 0 + 0.3

Combine like terms: -0.3 + 0.3 = 0.0
0.0 + 2X + X2 = 0 + 0.3
2X + X2 = 0 + 0.3

Combine like terms: 0 + 0.3 = 0.3
2X + X2 = 0.3

The X term is 2X.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2X + 1 + X2 = 0.3 + 1

Reorder the terms:
1 + 2X + X2 = 0.3 + 1

Combine like terms: 0.3 + 1 = 1.3
1 + 2X + X2 = 1.3

Factor a perfect square on the left side:
(X + 1)(X + 1) = 1.3

Calculate the square root of the right side: 1.140175425

Break this problem into two subproblems by setting 
(X + 1) equal to 1.140175425 and -1.140175425.

Subproblem 1

X + 1 = 1.140175425 Simplifying X + 1 = 1.140175425 Reorder the terms: 1 + X = 1.140175425 Solving 1 + X = 1.140175425 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + X = 1.140175425 + -1 Combine like terms: 1 + -1 = 0 0 + X = 1.140175425 + -1 X = 1.140175425 + -1 Combine like terms: 1.140175425 + -1 = 0.140175425 X = 0.140175425 Simplifying X = 0.140175425

Subproblem 2

X + 1 = -1.140175425 Simplifying X + 1 = -1.140175425 Reorder the terms: 1 + X = -1.140175425 Solving 1 + X = -1.140175425 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + X = -1.140175425 + -1 Combine like terms: 1 + -1 = 0 0 + X = -1.140175425 + -1 X = -1.140175425 + -1 Combine like terms: -1.140175425 + -1 = -2.140175425 X = -2.140175425 Simplifying X = -2.140175425

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.140175425, -2.140175425}

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