8y^2-63y-1215=0

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Solution for 8y^2-63y-1215=0 equation: 


Simplifying
8y2 + -63y + -1215 = 0

Reorder the terms:
-1215 + -63y + 8y2 = 0

Solving
-1215 + -63y + 8y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-9 + -1y)(135 + -8y) = 0


Subproblem 1
Set the factor '(-9 + -1y)' equal to zero and attempt to solve:

Simplifying
-9 + -1y = 0

Solving
-9 + -1y = 0

Move all terms containing y to the left, all other terms to the right.

Add '9' to each side of the equation.
-9 + 9 + -1y = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1y = 0 + 9
-1y = 0 + 9

Combine like terms: 0 + 9 = 9
-1y = 9

Divide each side by '-1'.
y = -9

Simplifying
y = -9

Subproblem 2
Set the factor '(135 + -8y)' equal to zero and attempt to solve:

Simplifying
135 + -8y = 0

Solving
135 + -8y = 0

Move all terms containing y to the left, all other terms to the right.

Add '-135' to each side of the equation.
135 + -135 + -8y = 0 + -135

Combine like terms: 135 + -135 = 0
0 + -8y = 0 + -135
-8y = 0 + -135

Combine like terms: 0 + -135 = -135
-8y = -135

Divide each side by '-8'.
y = 16.875

Simplifying
y = 16.875
Solution
y = {-9, 16.875}

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