y^2+7y-4=-4y+6

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Solution for y^2+7y-4=-4y+6 equation:


Simplifying
y2 + 7y + -4 = -4y + 6

Reorder the terms:
-4 + 7y + y2 = -4y + 6

Reorder the terms:
-4 + 7y + y2 = 6 + -4y

Solving
-4 + 7y + y2 = 6 + -4y

Solving for variable 'y'.

Reorder the terms:
-4 + -6 + 7y + 4y + y2 = 6 + -4y + -6 + 4y

Combine like terms: -4 + -6 = -10
-10 + 7y + 4y + y2 = 6 + -4y + -6 + 4y

Combine like terms: 7y + 4y = 11y
-10 + 11y + y2 = 6 + -4y + -6 + 4y

Reorder the terms:
-10 + 11y + y2 = 6 + -6 + -4y + 4y

Combine like terms: 6 + -6 = 0
-10 + 11y + y2 = 0 + -4y + 4y
-10 + 11y + y2 = -4y + 4y

Combine like terms: -4y + 4y = 0
-10 + 11y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 11y + 10 + y2 = 0 + 10

Reorder the terms:
-10 + 10 + 11y + y2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 11y + y2 = 0 + 10
11y + y2 = 0 + 10

Combine like terms: 0 + 10 = 10
11y + y2 = 10

The y term is 11y.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11y + 30.25 + y2 = 10 + 30.25

Reorder the terms:
30.25 + 11y + y2 = 10 + 30.25

Combine like terms: 10 + 30.25 = 40.25
30.25 + 11y + y2 = 40.25

Factor a perfect square on the left side:
(y + 5.5)(y + 5.5) = 40.25

Calculate the square root of the right side: 6.34428877

Break this problem into two subproblems by setting 
(y + 5.5) equal to 6.34428877 and -6.34428877.

Subproblem 1

y + 5.5 = 6.34428877 Simplifying y + 5.5 = 6.34428877 Reorder the terms: 5.5 + y = 6.34428877 Solving 5.5 + y = 6.34428877 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + y = 6.34428877 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + y = 6.34428877 + -5.5 y = 6.34428877 + -5.5 Combine like terms: 6.34428877 + -5.5 = 0.84428877 y = 0.84428877 Simplifying y = 0.84428877

Subproblem 2

y + 5.5 = -6.34428877 Simplifying y + 5.5 = -6.34428877 Reorder the terms: 5.5 + y = -6.34428877 Solving 5.5 + y = -6.34428877 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + y = -6.34428877 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + y = -6.34428877 + -5.5 y = -6.34428877 + -5.5 Combine like terms: -6.34428877 + -5.5 = -11.84428877 y = -11.84428877 Simplifying y = -11.84428877

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.84428877, -11.84428877}

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