y^2+3y+10=70

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Solution for y^2+3y+10=70 equation:


Simplifying
y2 + 3y + 10 = 70

Reorder the terms:
10 + 3y + y2 = 70

Solving
10 + 3y + y2 = 70

Solving for variable 'y'.

Reorder the terms:
10 + -70 + 3y + y2 = 70 + -70

Combine like terms: 10 + -70 = -60
-60 + 3y + y2 = 70 + -70

Combine like terms: 70 + -70 = 0
-60 + 3y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 3y + 60 + y2 = 0 + 60

Reorder the terms:
-60 + 60 + 3y + y2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 3y + y2 = 0 + 60
3y + y2 = 0 + 60

Combine like terms: 0 + 60 = 60
3y + y2 = 60

The y term is 3y.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3y + 2.25 + y2 = 60 + 2.25

Reorder the terms:
2.25 + 3y + y2 = 60 + 2.25

Combine like terms: 60 + 2.25 = 62.25
2.25 + 3y + y2 = 62.25

Factor a perfect square on the left side:
(y + 1.5)(y + 1.5) = 62.25

Calculate the square root of the right side: 7.889866919

Break this problem into two subproblems by setting 
(y + 1.5) equal to 7.889866919 and -7.889866919.

Subproblem 1

y + 1.5 = 7.889866919 Simplifying y + 1.5 = 7.889866919 Reorder the terms: 1.5 + y = 7.889866919 Solving 1.5 + y = 7.889866919 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = 7.889866919 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = 7.889866919 + -1.5 y = 7.889866919 + -1.5 Combine like terms: 7.889866919 + -1.5 = 6.389866919 y = 6.389866919 Simplifying y = 6.389866919

Subproblem 2

y + 1.5 = -7.889866919 Simplifying y + 1.5 = -7.889866919 Reorder the terms: 1.5 + y = -7.889866919 Solving 1.5 + y = -7.889866919 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = -7.889866919 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = -7.889866919 + -1.5 y = -7.889866919 + -1.5 Combine like terms: -7.889866919 + -1.5 = -9.389866919 y = -9.389866919 Simplifying y = -9.389866919

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.389866919, -9.389866919}

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