y^2+3y-10=10

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


Simplifying
y2 + 3y + -10 = 10

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

Solving
-10 + 3y + y2 = 10

Solving for variable 'y'.

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

Combine like terms: -10 + -10 = -20
-20 + 3y + y2 = 10 + -10

Combine like terms: 10 + -10 = 0
-20 + 3y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 3y + 20 + y2 = 0 + 20

Reorder the terms:
-20 + 20 + 3y + y2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 3y + y2 = 0 + 20
3y + y2 = 0 + 20

Combine like terms: 0 + 20 = 20
3y + y2 = 20

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 = 20 + 2.25

Reorder the terms:
2.25 + 3y + y2 = 20 + 2.25

Combine like terms: 20 + 2.25 = 22.25
2.25 + 3y + y2 = 22.25

Factor a perfect square on the left side:
(y + 1.5)(y + 1.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(y + 1.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

y + 1.5 = 4.716990566 Simplifying y + 1.5 = 4.716990566 Reorder the terms: 1.5 + y = 4.716990566 Solving 1.5 + y = 4.716990566 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 = 4.716990566 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = 4.716990566 + -1.5 y = 4.716990566 + -1.5 Combine like terms: 4.716990566 + -1.5 = 3.216990566 y = 3.216990566 Simplifying y = 3.216990566

Subproblem 2

y + 1.5 = -4.716990566 Simplifying y + 1.5 = -4.716990566 Reorder the terms: 1.5 + y = -4.716990566 Solving 1.5 + y = -4.716990566 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 = -4.716990566 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = -4.716990566 + -1.5 y = -4.716990566 + -1.5 Combine like terms: -4.716990566 + -1.5 = -6.216990566 y = -6.216990566 Simplifying y = -6.216990566

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.216990566, -6.216990566}

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