4(y+10)y=5

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Solution for 4(y+10)y=5 equation:


Simplifying
4(y + 10) * y = 5

Reorder the terms:
4(10 + y) * y = 5

Reorder the terms for easier multiplication:
4y(10 + y) = 5
(10 * 4y + y * 4y) = 5
(40y + 4y2) = 5

Solving
40y + 4y2 = 5

Solving for variable 'y'.

Reorder the terms:
-5 + 40y + 4y2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 40y + 4y2 = 0

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

Divide each side by '4'.
-1.25 + 10y + y2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 10y + 1.25 + y2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 10y + y2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 10y + y2 = 0 + 1.25
10y + y2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
10y + y2 = 1.25

The y term is 10y.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10y + 25 + y2 = 1.25 + 25

Reorder the terms:
25 + 10y + y2 = 1.25 + 25

Combine like terms: 1.25 + 25 = 26.25
25 + 10y + y2 = 26.25

Factor a perfect square on the left side:
(y + 5)(y + 5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(y + 5) equal to 5.123475383 and -5.123475383.

Subproblem 1

y + 5 = 5.123475383 Simplifying y + 5 = 5.123475383 Reorder the terms: 5 + y = 5.123475383 Solving 5 + y = 5.123475383 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + y = 5.123475383 + -5 Combine like terms: 5 + -5 = 0 0 + y = 5.123475383 + -5 y = 5.123475383 + -5 Combine like terms: 5.123475383 + -5 = 0.123475383 y = 0.123475383 Simplifying y = 0.123475383

Subproblem 2

y + 5 = -5.123475383 Simplifying y + 5 = -5.123475383 Reorder the terms: 5 + y = -5.123475383 Solving 5 + y = -5.123475383 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + y = -5.123475383 + -5 Combine like terms: 5 + -5 = 0 0 + y = -5.123475383 + -5 y = -5.123475383 + -5 Combine like terms: -5.123475383 + -5 = -10.123475383 y = -10.123475383 Simplifying y = -10.123475383

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.123475383, -10.123475383}

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