(9-v)(5v+2)=0

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Solution for (9-v)(5v+2)=0 equation: 


Simplifying
(9 + -1v)(5v + 2) = 0

Reorder the terms:
(9 + -1v)(2 + 5v) = 0

Multiply (9 + -1v) * (2 + 5v)
(9(2 + 5v) + -1v * (2 + 5v)) = 0
((2 * 9 + 5v * 9) + -1v * (2 + 5v)) = 0
((18 + 45v) + -1v * (2 + 5v)) = 0
(18 + 45v + (2 * -1v + 5v * -1v)) = 0
(18 + 45v + (-2v + -5v2)) = 0

Combine like terms: 45v + -2v = 43v
(18 + 43v + -5v2) = 0

Solving
18 + 43v + -5v2 = 0

Solving for variable 'v'.

Factor a trinomial.
(9 + -1v)(2 + 5v) = 0


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

Simplifying
9 + -1v = 0

Solving
9 + -1v = 0

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

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

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

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

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

Simplifying
v = 9

Subproblem 2
Set the factor '(2 + 5v)' equal to zero and attempt to solve:

Simplifying
2 + 5v = 0

Solving
2 + 5v = 0

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

Add '-2' to each side of the equation.
2 + -2 + 5v = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 5v = 0 + -2
5v = 0 + -2

Combine like terms: 0 + -2 = -2
5v = -2

Divide each side by '5'.
v = -0.4

Simplifying
v = -0.4
Solution
v = {9, -0.4}

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