4-3v(2+5v)+7=

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Solution for 4-3v(2+5v)+7= equation:


Simplifying
4 + -3v(2 + 5v) + 7 = 0
4 + (2 * -3v + 5v * -3v) + 7 = 0
4 + (-6v + -15v2) + 7 = 0

Reorder the terms:
4 + 7 + -6v + -15v2 = 0

Combine like terms: 4 + 7 = 11
11 + -6v + -15v2 = 0

Solving
11 + -6v + -15v2 = 0

Solving for variable 'v'.

Begin completing the square.  Divide all terms by
-15 the coefficient of the squared term: 

Divide each side by '-15'.
-0.7333333333 + 0.4v + v2 = 0

Move the constant term to the right:

Add '0.7333333333' to each side of the equation.
-0.7333333333 + 0.4v + 0.7333333333 + v2 = 0 + 0.7333333333

Reorder the terms:
-0.7333333333 + 0.7333333333 + 0.4v + v2 = 0 + 0.7333333333

Combine like terms: -0.7333333333 + 0.7333333333 = 0.0000000000
0.0000000000 + 0.4v + v2 = 0 + 0.7333333333
0.4v + v2 = 0 + 0.7333333333

Combine like terms: 0 + 0.7333333333 = 0.7333333333
0.4v + v2 = 0.7333333333

The v term is 0.4v.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4v + 0.04 + v2 = 0.7333333333 + 0.04

Reorder the terms:
0.04 + 0.4v + v2 = 0.7333333333 + 0.04

Combine like terms: 0.7333333333 + 0.04 = 0.7733333333
0.04 + 0.4v + v2 = 0.7733333333

Factor a perfect square on the left side:
(v + 0.2)(v + 0.2) = 0.7733333333

Calculate the square root of the right side: 0.879393731

Break this problem into two subproblems by setting 
(v + 0.2) equal to 0.879393731 and -0.879393731.

Subproblem 1

v + 0.2 = 0.879393731 Simplifying v + 0.2 = 0.879393731 Reorder the terms: 0.2 + v = 0.879393731 Solving 0.2 + v = 0.879393731 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + v = 0.879393731 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + v = 0.879393731 + -0.2 v = 0.879393731 + -0.2 Combine like terms: 0.879393731 + -0.2 = 0.679393731 v = 0.679393731 Simplifying v = 0.679393731

Subproblem 2

v + 0.2 = -0.879393731 Simplifying v + 0.2 = -0.879393731 Reorder the terms: 0.2 + v = -0.879393731 Solving 0.2 + v = -0.879393731 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + v = -0.879393731 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + v = -0.879393731 + -0.2 v = -0.879393731 + -0.2 Combine like terms: -0.879393731 + -0.2 = -1.079393731 v = -1.079393731 Simplifying v = -1.079393731

Solution

The solution to the problem is based on the solutions from the subproblems. v = {0.679393731, -1.079393731}

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