(y*y)-6y=-7

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Solution for (y*y)-6y=-7 equation:


Simplifying
(y * y) + -6y = -7

Multiply y * y
(y2) + -6y = -7
y2 + -6y = -7

Reorder the terms:
-6y + y2 = -7

Solving
-6y + y2 = -7

Solving for variable 'y'.

Reorder the terms:
7 + -6y + y2 = -7 + 7

Combine like terms: -7 + 7 = 0
7 + -6y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -6y + -7 + y2 = 0 + -7

Reorder the terms:
7 + -7 + -6y + y2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -6y + y2 = 0 + -7
-6y + y2 = 0 + -7

Combine like terms: 0 + -7 = -7
-6y + y2 = -7

The y term is -6y.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6y + 9 + y2 = -7 + 9

Reorder the terms:
9 + -6y + y2 = -7 + 9

Combine like terms: -7 + 9 = 2
9 + -6y + y2 = 2

Factor a perfect square on the left side:
(y + -3)(y + -3) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(y + -3) equal to 1.414213562 and -1.414213562.

Subproblem 1

y + -3 = 1.414213562 Simplifying y + -3 = 1.414213562 Reorder the terms: -3 + y = 1.414213562 Solving -3 + y = 1.414213562 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = 1.414213562 + 3 Combine like terms: -3 + 3 = 0 0 + y = 1.414213562 + 3 y = 1.414213562 + 3 Combine like terms: 1.414213562 + 3 = 4.414213562 y = 4.414213562 Simplifying y = 4.414213562

Subproblem 2

y + -3 = -1.414213562 Simplifying y + -3 = -1.414213562 Reorder the terms: -3 + y = -1.414213562 Solving -3 + y = -1.414213562 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = -1.414213562 + 3 Combine like terms: -3 + 3 = 0 0 + y = -1.414213562 + 3 y = -1.414213562 + 3 Combine like terms: -1.414213562 + 3 = 1.585786438 y = 1.585786438 Simplifying y = 1.585786438

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.414213562, 1.585786438}

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