49-14y-y^2=0

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Solution for 49-14y-y^2=0 equation:


Simplifying
49 + -14y + -1y2 = 0

Solving
49 + -14y + -1y2 = 0

Solving for variable 'y'.

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

Divide each side by '-1'.
-49 + 14y + y2 = 0

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + 14y + 49 + y2 = 0 + 49

Reorder the terms:
-49 + 49 + 14y + y2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + 14y + y2 = 0 + 49
14y + y2 = 0 + 49

Combine like terms: 0 + 49 = 49
14y + y2 = 49

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 = 49 + 49

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

Combine like terms: 49 + 49 = 98
49 + 14y + y2 = 98

Factor a perfect square on the left side:
(y + 7)(y + 7) = 98

Calculate the square root of the right side: 9.899494937

Break this problem into two subproblems by setting 
(y + 7) equal to 9.899494937 and -9.899494937.

Subproblem 1

y + 7 = 9.899494937 Simplifying y + 7 = 9.899494937 Reorder the terms: 7 + y = 9.899494937 Solving 7 + y = 9.899494937 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 = 9.899494937 + -7 Combine like terms: 7 + -7 = 0 0 + y = 9.899494937 + -7 y = 9.899494937 + -7 Combine like terms: 9.899494937 + -7 = 2.899494937 y = 2.899494937 Simplifying y = 2.899494937

Subproblem 2

y + 7 = -9.899494937 Simplifying y + 7 = -9.899494937 Reorder the terms: 7 + y = -9.899494937 Solving 7 + y = -9.899494937 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 = -9.899494937 + -7 Combine like terms: 7 + -7 = 0 0 + y = -9.899494937 + -7 y = -9.899494937 + -7 Combine like terms: -9.899494937 + -7 = -16.899494937 y = -16.899494937 Simplifying y = -16.899494937

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.899494937, -16.899494937}

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