(v-1)(5v+2)=9(v+3)

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Solution for (v-1)(5v+2)=9(v+3) equation:


Simplifying
(v + -1)(5v + 2) = 9(v + 3)

Reorder the terms:
(-1 + v)(5v + 2) = 9(v + 3)

Reorder the terms:
(-1 + v)(2 + 5v) = 9(v + 3)

Multiply (-1 + v) * (2 + 5v)
(-1(2 + 5v) + v(2 + 5v)) = 9(v + 3)
((2 * -1 + 5v * -1) + v(2 + 5v)) = 9(v + 3)
((-2 + -5v) + v(2 + 5v)) = 9(v + 3)
(-2 + -5v + (2 * v + 5v * v)) = 9(v + 3)
(-2 + -5v + (2v + 5v2)) = 9(v + 3)

Combine like terms: -5v + 2v = -3v
(-2 + -3v + 5v2) = 9(v + 3)

Reorder the terms:
-2 + -3v + 5v2 = 9(3 + v)
-2 + -3v + 5v2 = (3 * 9 + v * 9)
-2 + -3v + 5v2 = (27 + 9v)

Solving
-2 + -3v + 5v2 = 27 + 9v

Solving for variable 'v'.

Reorder the terms:
-2 + -27 + -3v + -9v + 5v2 = 27 + 9v + -27 + -9v

Combine like terms: -2 + -27 = -29
-29 + -3v + -9v + 5v2 = 27 + 9v + -27 + -9v

Combine like terms: -3v + -9v = -12v
-29 + -12v + 5v2 = 27 + 9v + -27 + -9v

Reorder the terms:
-29 + -12v + 5v2 = 27 + -27 + 9v + -9v

Combine like terms: 27 + -27 = 0
-29 + -12v + 5v2 = 0 + 9v + -9v
-29 + -12v + 5v2 = 9v + -9v

Combine like terms: 9v + -9v = 0
-29 + -12v + 5v2 = 0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-5.8 + -2.4v + v2 = 0

Move the constant term to the right:

Add '5.8' to each side of the equation.
-5.8 + -2.4v + 5.8 + v2 = 0 + 5.8

Reorder the terms:
-5.8 + 5.8 + -2.4v + v2 = 0 + 5.8

Combine like terms: -5.8 + 5.8 = 0.0
0.0 + -2.4v + v2 = 0 + 5.8
-2.4v + v2 = 0 + 5.8

Combine like terms: 0 + 5.8 = 5.8
-2.4v + v2 = 5.8

The v term is -2.4v.  Take half its coefficient (-1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
-2.4v + 1.44 + v2 = 5.8 + 1.44

Reorder the terms:
1.44 + -2.4v + v2 = 5.8 + 1.44

Combine like terms: 5.8 + 1.44 = 7.24
1.44 + -2.4v + v2 = 7.24

Factor a perfect square on the left side:
(v + -1.2)(v + -1.2) = 7.24

Calculate the square root of the right side: 2.690724809

Break this problem into two subproblems by setting 
(v + -1.2) equal to 2.690724809 and -2.690724809.

Subproblem 1

v + -1.2 = 2.690724809 Simplifying v + -1.2 = 2.690724809 Reorder the terms: -1.2 + v = 2.690724809 Solving -1.2 + v = 2.690724809 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + v = 2.690724809 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + v = 2.690724809 + 1.2 v = 2.690724809 + 1.2 Combine like terms: 2.690724809 + 1.2 = 3.890724809 v = 3.890724809 Simplifying v = 3.890724809

Subproblem 2

v + -1.2 = -2.690724809 Simplifying v + -1.2 = -2.690724809 Reorder the terms: -1.2 + v = -2.690724809 Solving -1.2 + v = -2.690724809 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + v = -2.690724809 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + v = -2.690724809 + 1.2 v = -2.690724809 + 1.2 Combine like terms: -2.690724809 + 1.2 = -1.490724809 v = -1.490724809 Simplifying v = -1.490724809

Solution

The solution to the problem is based on the solutions from the subproblems. v = {3.890724809, -1.490724809}

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