(9+y)(5y-7)=0

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Solution for (9+y)(5y-7)=0 equation: 


Simplifying
(9 + y)(5y + -7) = 0

Reorder the terms:
(9 + y)(-7 + 5y) = 0

Multiply (9 + y) * (-7 + 5y)
(9(-7 + 5y) + y(-7 + 5y)) = 0
((-7 * 9 + 5y * 9) + y(-7 + 5y)) = 0
((-63 + 45y) + y(-7 + 5y)) = 0
(-63 + 45y + (-7 * y + 5y * y)) = 0
(-63 + 45y + (-7y + 5y2)) = 0

Combine like terms: 45y + -7y = 38y
(-63 + 38y + 5y2) = 0

Solving
-63 + 38y + 5y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-9 + -1y)(7 + -5y) = 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 '(7 + -5y)' equal to zero and attempt to solve:

Simplifying
7 + -5y = 0

Solving
7 + -5y = 0

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

Add '-7' to each side of the equation.
7 + -7 + -5y = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -5y = 0 + -7
-5y = 0 + -7

Combine like terms: 0 + -7 = -7
-5y = -7

Divide each side by '-5'.
y = 1.4

Simplifying
y = 1.4
Solution
y = {-9, 1.4}

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