(2y+7)2y=-3

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Solution for (2y+7)2y=-3 equation:


Simplifying
(2y + 7) * 2y = -3

Reorder the terms:
(7 + 2y) * 2y = -3

Reorder the terms for easier multiplication:
2y(7 + 2y) = -3
(7 * 2y + 2y * 2y) = -3
(14y + 4y2) = -3

Solving
14y + 4y2 = -3

Solving for variable 'y'.

Reorder the terms:
3 + 14y + 4y2 = -3 + 3

Combine like terms: -3 + 3 = 0
3 + 14y + 4y2 = 0

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

Divide each side by '4'.
0.75 + 3.5y + y2 = 0

Move the constant term to the right:

Add '-0.75' to each side of the equation.
0.75 + 3.5y + -0.75 + y2 = 0 + -0.75

Reorder the terms:
0.75 + -0.75 + 3.5y + y2 = 0 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
0.00 + 3.5y + y2 = 0 + -0.75
3.5y + y2 = 0 + -0.75

Combine like terms: 0 + -0.75 = -0.75
3.5y + y2 = -0.75

The y term is 3.5y.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5y + 3.0625 + y2 = -0.75 + 3.0625

Reorder the terms:
3.0625 + 3.5y + y2 = -0.75 + 3.0625

Combine like terms: -0.75 + 3.0625 = 2.3125
3.0625 + 3.5y + y2 = 2.3125

Factor a perfect square on the left side:
(y + 1.75)(y + 1.75) = 2.3125

Calculate the square root of the right side: 1.520690633

Break this problem into two subproblems by setting 
(y + 1.75) equal to 1.520690633 and -1.520690633.

Subproblem 1

y + 1.75 = 1.520690633 Simplifying y + 1.75 = 1.520690633 Reorder the terms: 1.75 + y = 1.520690633 Solving 1.75 + y = 1.520690633 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + y = 1.520690633 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = 1.520690633 + -1.75 y = 1.520690633 + -1.75 Combine like terms: 1.520690633 + -1.75 = -0.229309367 y = -0.229309367 Simplifying y = -0.229309367

Subproblem 2

y + 1.75 = -1.520690633 Simplifying y + 1.75 = -1.520690633 Reorder the terms: 1.75 + y = -1.520690633 Solving 1.75 + y = -1.520690633 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + y = -1.520690633 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = -1.520690633 + -1.75 y = -1.520690633 + -1.75 Combine like terms: -1.520690633 + -1.75 = -3.270690633 y = -3.270690633 Simplifying y = -3.270690633

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.229309367, -3.270690633}

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