2y^2+3y-6.875=0

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Solution for 2y^2+3y-6.875=0 equation:


Simplifying
2y2 + 3y + -6.875 = 0

Reorder the terms:
-6.875 + 3y + 2y2 = 0

Solving
-6.875 + 3y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-3.4375 + 1.5y + y2 = 0

Move the constant term to the right:

Add '3.4375' to each side of the equation.
-3.4375 + 1.5y + 3.4375 + y2 = 0 + 3.4375

Reorder the terms:
-3.4375 + 3.4375 + 1.5y + y2 = 0 + 3.4375

Combine like terms: -3.4375 + 3.4375 = 0.0000
0.0000 + 1.5y + y2 = 0 + 3.4375
1.5y + y2 = 0 + 3.4375

Combine like terms: 0 + 3.4375 = 3.4375
1.5y + y2 = 3.4375

The y term is 1.5y.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5y + 0.5625 + y2 = 3.4375 + 0.5625

Reorder the terms:
0.5625 + 1.5y + y2 = 3.4375 + 0.5625

Combine like terms: 3.4375 + 0.5625 = 4
0.5625 + 1.5y + y2 = 4

Factor a perfect square on the left side:
(y + 0.75)(y + 0.75) = 4

Calculate the square root of the right side: 2

Break this problem into two subproblems by setting 
(y + 0.75) equal to 2 and -2.

Subproblem 1

y + 0.75 = 2 Simplifying y + 0.75 = 2 Reorder the terms: 0.75 + y = 2 Solving 0.75 + y = 2 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + y = 2 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + y = 2 + -0.75 y = 2 + -0.75 Combine like terms: 2 + -0.75 = 1.25 y = 1.25 Simplifying y = 1.25

Subproblem 2

y + 0.75 = -2 Simplifying y + 0.75 = -2 Reorder the terms: 0.75 + y = -2 Solving 0.75 + y = -2 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + y = -2 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + y = -2 + -0.75 y = -2 + -0.75 Combine like terms: -2 + -0.75 = -2.75 y = -2.75 Simplifying y = -2.75

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.25, -2.75}

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