y^2+.4y-.05=0

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Solution for y^2+.4y-.05=0 equation:


Simplifying
y2 + 0.4y + -0.05 = 0

Reorder the terms:
-0.05 + 0.4y + y2 = 0

Solving
-0.05 + 0.4y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '0.05' to each side of the equation.
-0.05 + 0.4y + 0.05 + y2 = 0 + 0.05

Reorder the terms:
-0.05 + 0.05 + 0.4y + y2 = 0 + 0.05

Combine like terms: -0.05 + 0.05 = 0.00
0.00 + 0.4y + y2 = 0 + 0.05
0.4y + y2 = 0 + 0.05

Combine like terms: 0 + 0.05 = 0.05
0.4y + y2 = 0.05

The y term is 0.4y.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4y + 0.04 + y2 = 0.05 + 0.04

Reorder the terms:
0.04 + 0.4y + y2 = 0.05 + 0.04

Combine like terms: 0.05 + 0.04 = 0.09
0.04 + 0.4y + y2 = 0.09

Factor a perfect square on the left side:
(y + 0.2)(y + 0.2) = 0.09

Calculate the square root of the right side: 0.3

Break this problem into two subproblems by setting 
(y + 0.2) equal to 0.3 and -0.3.

Subproblem 1

y + 0.2 = 0.3 Simplifying y + 0.2 = 0.3 Reorder the terms: 0.2 + y = 0.3 Solving 0.2 + y = 0.3 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + y = 0.3 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + y = 0.3 + -0.2 y = 0.3 + -0.2 Combine like terms: 0.3 + -0.2 = 0.1 y = 0.1 Simplifying y = 0.1

Subproblem 2

y + 0.2 = -0.3 Simplifying y + 0.2 = -0.3 Reorder the terms: 0.2 + y = -0.3 Solving 0.2 + y = -0.3 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + y = -0.3 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + y = -0.3 + -0.2 y = -0.3 + -0.2 Combine like terms: -0.3 + -0.2 = -0.5 y = -0.5 Simplifying y = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.1, -0.5}

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