y^2+7y+10=30

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Solution for y^2+7y+10=30 equation:


Simplifying
y2 + 7y + 10 = 30

Reorder the terms:
10 + 7y + y2 = 30

Solving
10 + 7y + y2 = 30

Solving for variable 'y'.

Reorder the terms:
10 + -30 + 7y + y2 = 30 + -30

Combine like terms: 10 + -30 = -20
-20 + 7y + y2 = 30 + -30

Combine like terms: 30 + -30 = 0
-20 + 7y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 7y + 20 + y2 = 0 + 20

Reorder the terms:
-20 + 20 + 7y + y2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 7y + y2 = 0 + 20
7y + y2 = 0 + 20

Combine like terms: 0 + 20 = 20
7y + y2 = 20

The y term is 7y.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7y + 12.25 + y2 = 20 + 12.25

Reorder the terms:
12.25 + 7y + y2 = 20 + 12.25

Combine like terms: 20 + 12.25 = 32.25
12.25 + 7y + y2 = 32.25

Factor a perfect square on the left side:
(y + 3.5)(y + 3.5) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(y + 3.5) equal to 5.678908346 and -5.678908346.

Subproblem 1

y + 3.5 = 5.678908346 Simplifying y + 3.5 = 5.678908346 Reorder the terms: 3.5 + y = 5.678908346 Solving 3.5 + y = 5.678908346 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + y = 5.678908346 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = 5.678908346 + -3.5 y = 5.678908346 + -3.5 Combine like terms: 5.678908346 + -3.5 = 2.178908346 y = 2.178908346 Simplifying y = 2.178908346

Subproblem 2

y + 3.5 = -5.678908346 Simplifying y + 3.5 = -5.678908346 Reorder the terms: 3.5 + y = -5.678908346 Solving 3.5 + y = -5.678908346 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + y = -5.678908346 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = -5.678908346 + -3.5 y = -5.678908346 + -3.5 Combine like terms: -5.678908346 + -3.5 = -9.178908346 y = -9.178908346 Simplifying y = -9.178908346

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.178908346, -9.178908346}

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