64=y(y)+42y

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Solution for 64=y(y)+42y equation:


Simplifying
64 = y(y) + 42y

Multiply y * y
64 = y2 + 42y

Reorder the terms:
64 = 42y + y2

Solving
64 = 42y + y2

Solving for variable 'y'.

Reorder the terms:
64 + -42y + -1y2 = 42y + -42y + y2 + -1y2

Combine like terms: 42y + -42y = 0
64 + -42y + -1y2 = 0 + y2 + -1y2
64 + -42y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
64 + -42y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-64 + 42y + y2 = 0

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + 42y + 64 + y2 = 0 + 64

Reorder the terms:
-64 + 64 + 42y + y2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + 42y + y2 = 0 + 64
42y + y2 = 0 + 64

Combine like terms: 0 + 64 = 64
42y + y2 = 64

The y term is 42y.  Take half its coefficient (21).
Square it (441) and add it to both sides.

Add '441' to each side of the equation.
42y + 441 + y2 = 64 + 441

Reorder the terms:
441 + 42y + y2 = 64 + 441

Combine like terms: 64 + 441 = 505
441 + 42y + y2 = 505

Factor a perfect square on the left side:
(y + 21)(y + 21) = 505

Calculate the square root of the right side: 22.472205054

Break this problem into two subproblems by setting 
(y + 21) equal to 22.472205054 and -22.472205054.

Subproblem 1

y + 21 = 22.472205054 Simplifying y + 21 = 22.472205054 Reorder the terms: 21 + y = 22.472205054 Solving 21 + y = 22.472205054 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + y = 22.472205054 + -21 Combine like terms: 21 + -21 = 0 0 + y = 22.472205054 + -21 y = 22.472205054 + -21 Combine like terms: 22.472205054 + -21 = 1.472205054 y = 1.472205054 Simplifying y = 1.472205054

Subproblem 2

y + 21 = -22.472205054 Simplifying y + 21 = -22.472205054 Reorder the terms: 21 + y = -22.472205054 Solving 21 + y = -22.472205054 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + y = -22.472205054 + -21 Combine like terms: 21 + -21 = 0 0 + y = -22.472205054 + -21 y = -22.472205054 + -21 Combine like terms: -22.472205054 + -21 = -43.472205054 y = -43.472205054 Simplifying y = -43.472205054

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.472205054, -43.472205054}

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