(42)7=(14+y)y

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Solution for (42)7=(14+y)y equation:


Simplifying
(42) * 7 = (14 + y) * y

Multiply 42 * 7
294 = (14 + y) * y

Reorder the terms for easier multiplication:
294 = y(14 + y)
294 = (14 * y + y * y)
294 = (14y + y2)

Solving
294 = 14y + y2

Solving for variable 'y'.

Reorder the terms:
294 + -14y + -1y2 = 14y + -14y + y2 + -1y2

Combine like terms: 14y + -14y = 0
294 + -14y + -1y2 = 0 + y2 + -1y2
294 + -14y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
294 + -14y + -1y2 = 0

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

Divide each side by '-1'.
-294 + 14y + y2 = 0

Move the constant term to the right:

Add '294' to each side of the equation.
-294 + 14y + 294 + y2 = 0 + 294

Reorder the terms:
-294 + 294 + 14y + y2 = 0 + 294

Combine like terms: -294 + 294 = 0
0 + 14y + y2 = 0 + 294
14y + y2 = 0 + 294

Combine like terms: 0 + 294 = 294
14y + y2 = 294

The y term is 14y.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14y + 49 + y2 = 294 + 49

Reorder the terms:
49 + 14y + y2 = 294 + 49

Combine like terms: 294 + 49 = 343
49 + 14y + y2 = 343

Factor a perfect square on the left side:
(y + 7)(y + 7) = 343

Calculate the square root of the right side: 18.520259177

Break this problem into two subproblems by setting 
(y + 7) equal to 18.520259177 and -18.520259177.

Subproblem 1

y + 7 = 18.520259177 Simplifying y + 7 = 18.520259177 Reorder the terms: 7 + y = 18.520259177 Solving 7 + y = 18.520259177 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + y = 18.520259177 + -7 Combine like terms: 7 + -7 = 0 0 + y = 18.520259177 + -7 y = 18.520259177 + -7 Combine like terms: 18.520259177 + -7 = 11.520259177 y = 11.520259177 Simplifying y = 11.520259177

Subproblem 2

y + 7 = -18.520259177 Simplifying y + 7 = -18.520259177 Reorder the terms: 7 + y = -18.520259177 Solving 7 + y = -18.520259177 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + y = -18.520259177 + -7 Combine like terms: 7 + -7 = 0 0 + y = -18.520259177 + -7 y = -18.520259177 + -7 Combine like terms: -18.520259177 + -7 = -25.520259177 y = -25.520259177 Simplifying y = -25.520259177

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.520259177, -25.520259177}

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