2y^2+5y-14=0

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Solution for 2y^2+5y-14=0 equation:


Simplifying
2y2 + 5y + -14 = 0

Reorder the terms:
-14 + 5y + 2y2 = 0

Solving
-14 + 5y + 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'.
-7 + 2.5y + y2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 2.5y + 7 + y2 = 0 + 7

Reorder the terms:
-7 + 7 + 2.5y + y2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 2.5y + y2 = 0 + 7
2.5y + y2 = 0 + 7

Combine like terms: 0 + 7 = 7
2.5y + y2 = 7

The y term is 2.5y.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5y + 1.5625 + y2 = 7 + 1.5625

Reorder the terms:
1.5625 + 2.5y + y2 = 7 + 1.5625

Combine like terms: 7 + 1.5625 = 8.5625
1.5625 + 2.5y + y2 = 8.5625

Factor a perfect square on the left side:
(y + 1.25)(y + 1.25) = 8.5625

Calculate the square root of the right side: 2.926174978

Break this problem into two subproblems by setting 
(y + 1.25) equal to 2.926174978 and -2.926174978.

Subproblem 1

y + 1.25 = 2.926174978 Simplifying y + 1.25 = 2.926174978 Reorder the terms: 1.25 + y = 2.926174978 Solving 1.25 + y = 2.926174978 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = 2.926174978 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = 2.926174978 + -1.25 y = 2.926174978 + -1.25 Combine like terms: 2.926174978 + -1.25 = 1.676174978 y = 1.676174978 Simplifying y = 1.676174978

Subproblem 2

y + 1.25 = -2.926174978 Simplifying y + 1.25 = -2.926174978 Reorder the terms: 1.25 + y = -2.926174978 Solving 1.25 + y = -2.926174978 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = -2.926174978 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = -2.926174978 + -1.25 y = -2.926174978 + -1.25 Combine like terms: -2.926174978 + -1.25 = -4.176174978 y = -4.176174978 Simplifying y = -4.176174978

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.676174978, -4.176174978}

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