y^2+17.88*y-20=0

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Solution for y^2+17.88*y-20=0 equation:


Simplifying
y2 + 17.88y + -20 = 0

Reorder the terms:
-20 + 17.88y + y2 = 0

Solving
-20 + 17.88y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 17.88y + 20 + y2 = 0 + 20

Reorder the terms:
-20 + 20 + 17.88y + y2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 17.88y + y2 = 0 + 20
17.88y + y2 = 0 + 20

Combine like terms: 0 + 20 = 20
17.88y + y2 = 20

The y term is 17.88y.  Take half its coefficient (8.94).
Square it (79.9236) and add it to both sides.

Add '79.9236' to each side of the equation.
17.88y + 79.9236 + y2 = 20 + 79.9236

Reorder the terms:
79.9236 + 17.88y + y2 = 20 + 79.9236

Combine like terms: 20 + 79.9236 = 99.9236
79.9236 + 17.88y + y2 = 99.9236

Factor a perfect square on the left side:
(y + 8.94)(y + 8.94) = 99.9236

Calculate the square root of the right side: 9.99617927

Break this problem into two subproblems by setting 
(y + 8.94) equal to 9.99617927 and -9.99617927.

Subproblem 1

y + 8.94 = 9.99617927 Simplifying y + 8.94 = 9.99617927 Reorder the terms: 8.94 + y = 9.99617927 Solving 8.94 + y = 9.99617927 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8.94' to each side of the equation. 8.94 + -8.94 + y = 9.99617927 + -8.94 Combine like terms: 8.94 + -8.94 = 0.00 0.00 + y = 9.99617927 + -8.94 y = 9.99617927 + -8.94 Combine like terms: 9.99617927 + -8.94 = 1.05617927 y = 1.05617927 Simplifying y = 1.05617927

Subproblem 2

y + 8.94 = -9.99617927 Simplifying y + 8.94 = -9.99617927 Reorder the terms: 8.94 + y = -9.99617927 Solving 8.94 + y = -9.99617927 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8.94' to each side of the equation. 8.94 + -8.94 + y = -9.99617927 + -8.94 Combine like terms: 8.94 + -8.94 = 0.00 0.00 + y = -9.99617927 + -8.94 y = -9.99617927 + -8.94 Combine like terms: -9.99617927 + -8.94 = -18.93617927 y = -18.93617927 Simplifying y = -18.93617927

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.05617927, -18.93617927}

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