5x*(14-x)=-30-2x

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Solution for 5x*(14-x)=-30-2x equation:


Simplifying
5x(14 + -1x) = -30 + -2x
(14 * 5x + -1x * 5x) = -30 + -2x
(70x + -5x2) = -30 + -2x

Solving
70x + -5x2 = -30 + -2x

Solving for variable 'x'.

Reorder the terms:
30 + 70x + 2x + -5x2 = -30 + -2x + 30 + 2x

Combine like terms: 70x + 2x = 72x
30 + 72x + -5x2 = -30 + -2x + 30 + 2x

Reorder the terms:
30 + 72x + -5x2 = -30 + 30 + -2x + 2x

Combine like terms: -30 + 30 = 0
30 + 72x + -5x2 = 0 + -2x + 2x
30 + 72x + -5x2 = -2x + 2x

Combine like terms: -2x + 2x = 0
30 + 72x + -5x2 = 0

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

Divide each side by '-5'.
-6 + -14.4x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -14.4x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -14.4x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -14.4x + x2 = 0 + 6
-14.4x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-14.4x + x2 = 6

The x term is -14.4x.  Take half its coefficient (-7.2).
Square it (51.84) and add it to both sides.

Add '51.84' to each side of the equation.
-14.4x + 51.84 + x2 = 6 + 51.84

Reorder the terms:
51.84 + -14.4x + x2 = 6 + 51.84

Combine like terms: 6 + 51.84 = 57.84
51.84 + -14.4x + x2 = 57.84

Factor a perfect square on the left side:
(x + -7.2)(x + -7.2) = 57.84

Calculate the square root of the right side: 7.605261337

Break this problem into two subproblems by setting 
(x + -7.2) equal to 7.605261337 and -7.605261337.

Subproblem 1

x + -7.2 = 7.605261337 Simplifying x + -7.2 = 7.605261337 Reorder the terms: -7.2 + x = 7.605261337 Solving -7.2 + x = 7.605261337 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.2' to each side of the equation. -7.2 + 7.2 + x = 7.605261337 + 7.2 Combine like terms: -7.2 + 7.2 = 0.0 0.0 + x = 7.605261337 + 7.2 x = 7.605261337 + 7.2 Combine like terms: 7.605261337 + 7.2 = 14.805261337 x = 14.805261337 Simplifying x = 14.805261337

Subproblem 2

x + -7.2 = -7.605261337 Simplifying x + -7.2 = -7.605261337 Reorder the terms: -7.2 + x = -7.605261337 Solving -7.2 + x = -7.605261337 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.2' to each side of the equation. -7.2 + 7.2 + x = -7.605261337 + 7.2 Combine like terms: -7.2 + 7.2 = 0.0 0.0 + x = -7.605261337 + 7.2 x = -7.605261337 + 7.2 Combine like terms: -7.605261337 + 7.2 = -0.405261337 x = -0.405261337 Simplifying x = -0.405261337

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.805261337, -0.405261337}

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