10y^2+2y-5=0

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Solution for 10y^2+2y-5=0 equation:


Simplifying
10y2 + 2y + -5 = 0

Reorder the terms:
-5 + 2y + 10y2 = 0

Solving
-5 + 2y + 10y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
10 the coefficient of the squared term: 

Divide each side by '10'.
-0.5 + 0.2y + y2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 0.2y + 0.5 + y2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 0.2y + y2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 0.2y + y2 = 0 + 0.5
0.2y + y2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
0.2y + y2 = 0.5

The y term is 0.2y.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2y + 0.01 + y2 = 0.5 + 0.01

Reorder the terms:
0.01 + 0.2y + y2 = 0.5 + 0.01

Combine like terms: 0.5 + 0.01 = 0.51
0.01 + 0.2y + y2 = 0.51

Factor a perfect square on the left side:
(y + 0.1)(y + 0.1) = 0.51

Calculate the square root of the right side: 0.714142843

Break this problem into two subproblems by setting 
(y + 0.1) equal to 0.714142843 and -0.714142843.

Subproblem 1

y + 0.1 = 0.714142843 Simplifying y + 0.1 = 0.714142843 Reorder the terms: 0.1 + y = 0.714142843 Solving 0.1 + y = 0.714142843 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + y = 0.714142843 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + y = 0.714142843 + -0.1 y = 0.714142843 + -0.1 Combine like terms: 0.714142843 + -0.1 = 0.614142843 y = 0.614142843 Simplifying y = 0.614142843

Subproblem 2

y + 0.1 = -0.714142843 Simplifying y + 0.1 = -0.714142843 Reorder the terms: 0.1 + y = -0.714142843 Solving 0.1 + y = -0.714142843 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + y = -0.714142843 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + y = -0.714142843 + -0.1 y = -0.714142843 + -0.1 Combine like terms: -0.714142843 + -0.1 = -0.814142843 y = -0.814142843 Simplifying y = -0.814142843

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.614142843, -0.814142843}

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