(x+6)(5x-3)=18

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Solution for (x+6)(5x-3)=18 equation:


Simplifying
(x + 6)(5x + -3) = 18

Reorder the terms:
(6 + x)(5x + -3) = 18

Reorder the terms:
(6 + x)(-3 + 5x) = 18

Multiply (6 + x) * (-3 + 5x)
(6(-3 + 5x) + x(-3 + 5x)) = 18
((-3 * 6 + 5x * 6) + x(-3 + 5x)) = 18
((-18 + 30x) + x(-3 + 5x)) = 18
(-18 + 30x + (-3 * x + 5x * x)) = 18
(-18 + 30x + (-3x + 5x2)) = 18

Combine like terms: 30x + -3x = 27x
(-18 + 27x + 5x2) = 18

Solving
-18 + 27x + 5x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + -18 + 27x + 5x2 = 18 + -18

Combine like terms: -18 + -18 = -36
-36 + 27x + 5x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-36 + 27x + 5x2 = 0

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

Divide each side by '5'.
-7.2 + 5.4x + x2 = 0

Move the constant term to the right:

Add '7.2' to each side of the equation.
-7.2 + 5.4x + 7.2 + x2 = 0 + 7.2

Reorder the terms:
-7.2 + 7.2 + 5.4x + x2 = 0 + 7.2

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + 5.4x + x2 = 0 + 7.2
5.4x + x2 = 0 + 7.2

Combine like terms: 0 + 7.2 = 7.2
5.4x + x2 = 7.2

The x term is 5.4x.  Take half its coefficient (2.7).
Square it (7.29) and add it to both sides.

Add '7.29' to each side of the equation.
5.4x + 7.29 + x2 = 7.2 + 7.29

Reorder the terms:
7.29 + 5.4x + x2 = 7.2 + 7.29

Combine like terms: 7.2 + 7.29 = 14.49
7.29 + 5.4x + x2 = 14.49

Factor a perfect square on the left side:
(x + 2.7)(x + 2.7) = 14.49

Calculate the square root of the right side: 3.806573262

Break this problem into two subproblems by setting 
(x + 2.7) equal to 3.806573262 and -3.806573262.

Subproblem 1

x + 2.7 = 3.806573262 Simplifying x + 2.7 = 3.806573262 Reorder the terms: 2.7 + x = 3.806573262 Solving 2.7 + x = 3.806573262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.7' to each side of the equation. 2.7 + -2.7 + x = 3.806573262 + -2.7 Combine like terms: 2.7 + -2.7 = 0.0 0.0 + x = 3.806573262 + -2.7 x = 3.806573262 + -2.7 Combine like terms: 3.806573262 + -2.7 = 1.106573262 x = 1.106573262 Simplifying x = 1.106573262

Subproblem 2

x + 2.7 = -3.806573262 Simplifying x + 2.7 = -3.806573262 Reorder the terms: 2.7 + x = -3.806573262 Solving 2.7 + x = -3.806573262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.7' to each side of the equation. 2.7 + -2.7 + x = -3.806573262 + -2.7 Combine like terms: 2.7 + -2.7 = 0.0 0.0 + x = -3.806573262 + -2.7 x = -3.806573262 + -2.7 Combine like terms: -3.806573262 + -2.7 = -6.506573262 x = -6.506573262 Simplifying x = -6.506573262

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.106573262, -6.506573262}

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