(y+7)y=5

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Solution for (y+7)y=5 equation:


Simplifying
(y + 7) * y = 5

Reorder the terms:
(7 + y) * y = 5

Reorder the terms for easier multiplication:
y(7 + y) = 5
(7 * y + y * y) = 5
(7y + y2) = 5

Solving
7y + y2 = 5

Solving for variable 'y'.

Reorder the terms:
-5 + 7y + y2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 7y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 7y + 5 + y2 = 0 + 5

Reorder the terms:
-5 + 5 + 7y + y2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 7y + y2 = 0 + 5
7y + y2 = 0 + 5

Combine like terms: 0 + 5 = 5
7y + y2 = 5

The y term is 7y.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7y + 12.25 + y2 = 5 + 12.25

Reorder the terms:
12.25 + 7y + y2 = 5 + 12.25

Combine like terms: 5 + 12.25 = 17.25
12.25 + 7y + y2 = 17.25

Factor a perfect square on the left side:
(y + 3.5)(y + 3.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(y + 3.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

y + 3.5 = 4.153311931 Simplifying y + 3.5 = 4.153311931 Reorder the terms: 3.5 + y = 4.153311931 Solving 3.5 + y = 4.153311931 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + y = 4.153311931 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = 4.153311931 + -3.5 y = 4.153311931 + -3.5 Combine like terms: 4.153311931 + -3.5 = 0.653311931 y = 0.653311931 Simplifying y = 0.653311931

Subproblem 2

y + 3.5 = -4.153311931 Simplifying y + 3.5 = -4.153311931 Reorder the terms: 3.5 + y = -4.153311931 Solving 3.5 + y = -4.153311931 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + y = -4.153311931 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = -4.153311931 + -3.5 y = -4.153311931 + -3.5 Combine like terms: -4.153311931 + -3.5 = -7.653311931 y = -7.653311931 Simplifying y = -7.653311931

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.653311931, -7.653311931}

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