(5x+4)(x-6)=9

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Solution for (5x+4)(x-6)=9 equation:


Simplifying
(5x + 4)(x + -6) = 9

Reorder the terms:
(4 + 5x)(x + -6) = 9

Reorder the terms:
(4 + 5x)(-6 + x) = 9

Multiply (4 + 5x) * (-6 + x)
(4(-6 + x) + 5x * (-6 + x)) = 9
((-6 * 4 + x * 4) + 5x * (-6 + x)) = 9
((-24 + 4x) + 5x * (-6 + x)) = 9
(-24 + 4x + (-6 * 5x + x * 5x)) = 9
(-24 + 4x + (-30x + 5x2)) = 9

Combine like terms: 4x + -30x = -26x
(-24 + -26x + 5x2) = 9

Solving
-24 + -26x + 5x2 = 9

Solving for variable 'x'.

Reorder the terms:
-24 + -9 + -26x + 5x2 = 9 + -9

Combine like terms: -24 + -9 = -33
-33 + -26x + 5x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-33 + -26x + 5x2 = 0

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

Divide each side by '5'.
-6.6 + -5.2x + x2 = 0

Move the constant term to the right:

Add '6.6' to each side of the equation.
-6.6 + -5.2x + 6.6 + x2 = 0 + 6.6

Reorder the terms:
-6.6 + 6.6 + -5.2x + x2 = 0 + 6.6

Combine like terms: -6.6 + 6.6 = 0.0
0.0 + -5.2x + x2 = 0 + 6.6
-5.2x + x2 = 0 + 6.6

Combine like terms: 0 + 6.6 = 6.6
-5.2x + x2 = 6.6

The x term is -5.2x.  Take half its coefficient (-2.6).
Square it (6.76) and add it to both sides.

Add '6.76' to each side of the equation.
-5.2x + 6.76 + x2 = 6.6 + 6.76

Reorder the terms:
6.76 + -5.2x + x2 = 6.6 + 6.76

Combine like terms: 6.6 + 6.76 = 13.36
6.76 + -5.2x + x2 = 13.36

Factor a perfect square on the left side:
(x + -2.6)(x + -2.6) = 13.36

Calculate the square root of the right side: 3.655133377

Break this problem into two subproblems by setting 
(x + -2.6) equal to 3.655133377 and -3.655133377.

Subproblem 1

x + -2.6 = 3.655133377 Simplifying x + -2.6 = 3.655133377 Reorder the terms: -2.6 + x = 3.655133377 Solving -2.6 + x = 3.655133377 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + x = 3.655133377 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + x = 3.655133377 + 2.6 x = 3.655133377 + 2.6 Combine like terms: 3.655133377 + 2.6 = 6.255133377 x = 6.255133377 Simplifying x = 6.255133377

Subproblem 2

x + -2.6 = -3.655133377 Simplifying x + -2.6 = -3.655133377 Reorder the terms: -2.6 + x = -3.655133377 Solving -2.6 + x = -3.655133377 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + x = -3.655133377 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + x = -3.655133377 + 2.6 x = -3.655133377 + 2.6 Combine like terms: -3.655133377 + 2.6 = -1.055133377 x = -1.055133377 Simplifying x = -1.055133377

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.255133377, -1.055133377}

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