y^2+7y+3=0

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Solution for y^2+7y+3=0 equation:


Simplifying
y2 + 7y + 3 = 0

Reorder the terms:
3 + 7y + y2 = 0

Solving
3 + 7y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 7y + -3 + y2 = 0 + -3

Reorder the terms:
3 + -3 + 7y + y2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 7y + y2 = 0 + -3
7y + y2 = 0 + -3

Combine like terms: 0 + -3 = -3
7y + y2 = -3

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 = -3 + 12.25

Reorder the terms:
12.25 + 7y + y2 = -3 + 12.25

Combine like terms: -3 + 12.25 = 9.25
12.25 + 7y + y2 = 9.25

Factor a perfect square on the left side:
(y + 3.5)(y + 3.5) = 9.25

Calculate the square root of the right side: 3.041381265

Break this problem into two subproblems by setting 
(y + 3.5) equal to 3.041381265 and -3.041381265.

Subproblem 1

y + 3.5 = 3.041381265 Simplifying y + 3.5 = 3.041381265 Reorder the terms: 3.5 + y = 3.041381265 Solving 3.5 + y = 3.041381265 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 = 3.041381265 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = 3.041381265 + -3.5 y = 3.041381265 + -3.5 Combine like terms: 3.041381265 + -3.5 = -0.458618735 y = -0.458618735 Simplifying y = -0.458618735

Subproblem 2

y + 3.5 = -3.041381265 Simplifying y + 3.5 = -3.041381265 Reorder the terms: 3.5 + y = -3.041381265 Solving 3.5 + y = -3.041381265 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 = -3.041381265 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = -3.041381265 + -3.5 y = -3.041381265 + -3.5 Combine like terms: -3.041381265 + -3.5 = -6.541381265 y = -6.541381265 Simplifying y = -6.541381265

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.458618735, -6.541381265}

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