2y^2+5y+10=40

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Solution for 2y^2+5y+10=40 equation:


Simplifying
2y2 + 5y + 10 = 40

Reorder the terms:
10 + 5y + 2y2 = 40

Solving
10 + 5y + 2y2 = 40

Solving for variable 'y'.

Reorder the terms:
10 + -40 + 5y + 2y2 = 40 + -40

Combine like terms: 10 + -40 = -30
-30 + 5y + 2y2 = 40 + -40

Combine like terms: 40 + -40 = 0
-30 + 5y + 2y2 = 0

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

Divide each side by '2'.
-15 + 2.5y + y2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 2.5y + 15 + y2 = 0 + 15

Reorder the terms:
-15 + 15 + 2.5y + y2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 2.5y + y2 = 0 + 15
2.5y + y2 = 0 + 15

Combine like terms: 0 + 15 = 15
2.5y + y2 = 15

The y term is 2.5y.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5y + 1.5625 + y2 = 15 + 1.5625

Reorder the terms:
1.5625 + 2.5y + y2 = 15 + 1.5625

Combine like terms: 15 + 1.5625 = 16.5625
1.5625 + 2.5y + y2 = 16.5625

Factor a perfect square on the left side:
(y + 1.25)(y + 1.25) = 16.5625

Calculate the square root of the right side: 4.069705149

Break this problem into two subproblems by setting 
(y + 1.25) equal to 4.069705149 and -4.069705149.

Subproblem 1

y + 1.25 = 4.069705149 Simplifying y + 1.25 = 4.069705149 Reorder the terms: 1.25 + y = 4.069705149 Solving 1.25 + y = 4.069705149 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = 4.069705149 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = 4.069705149 + -1.25 y = 4.069705149 + -1.25 Combine like terms: 4.069705149 + -1.25 = 2.819705149 y = 2.819705149 Simplifying y = 2.819705149

Subproblem 2

y + 1.25 = -4.069705149 Simplifying y + 1.25 = -4.069705149 Reorder the terms: 1.25 + y = -4.069705149 Solving 1.25 + y = -4.069705149 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = -4.069705149 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = -4.069705149 + -1.25 y = -4.069705149 + -1.25 Combine like terms: -4.069705149 + -1.25 = -5.319705149 y = -5.319705149 Simplifying y = -5.319705149

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.819705149, -5.319705149}

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