4y(y+2)=7

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Solution for 4y(y+2)=7 equation:


Simplifying
4y(y + 2) = 7

Reorder the terms:
4y(2 + y) = 7
(2 * 4y + y * 4y) = 7
(8y + 4y2) = 7

Solving
8y + 4y2 = 7

Solving for variable 'y'.

Reorder the terms:
-7 + 8y + 4y2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 8y + 4y2 = 0

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

Divide each side by '4'.
-1.75 + 2y + y2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + 2y + 1.75 + y2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + 2y + y2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + 2y + y2 = 0 + 1.75
2y + y2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
2y + y2 = 1.75

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 1.75 + 1

Reorder the terms:
1 + 2y + y2 = 1.75 + 1

Combine like terms: 1.75 + 1 = 2.75
1 + 2y + y2 = 2.75

Factor a perfect square on the left side:
(y + 1)(y + 1) = 2.75

Calculate the square root of the right side: 1.658312395

Break this problem into two subproblems by setting 
(y + 1) equal to 1.658312395 and -1.658312395.

Subproblem 1

y + 1 = 1.658312395 Simplifying y + 1 = 1.658312395 Reorder the terms: 1 + y = 1.658312395 Solving 1 + y = 1.658312395 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 1.658312395 + -1 Combine like terms: 1 + -1 = 0 0 + y = 1.658312395 + -1 y = 1.658312395 + -1 Combine like terms: 1.658312395 + -1 = 0.658312395 y = 0.658312395 Simplifying y = 0.658312395

Subproblem 2

y + 1 = -1.658312395 Simplifying y + 1 = -1.658312395 Reorder the terms: 1 + y = -1.658312395 Solving 1 + y = -1.658312395 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -1.658312395 + -1 Combine like terms: 1 + -1 = 0 0 + y = -1.658312395 + -1 y = -1.658312395 + -1 Combine like terms: -1.658312395 + -1 = -2.658312395 y = -2.658312395 Simplifying y = -2.658312395

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.658312395, -2.658312395}

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