(4x+5)(x-6)=7

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Solution for (4x+5)(x-6)=7 equation:


Simplifying
(4x + 5)(x + -6) = 7

Reorder the terms:
(5 + 4x)(x + -6) = 7

Reorder the terms:
(5 + 4x)(-6 + x) = 7

Multiply (5 + 4x) * (-6 + x)
(5(-6 + x) + 4x * (-6 + x)) = 7
((-6 * 5 + x * 5) + 4x * (-6 + x)) = 7
((-30 + 5x) + 4x * (-6 + x)) = 7
(-30 + 5x + (-6 * 4x + x * 4x)) = 7
(-30 + 5x + (-24x + 4x2)) = 7

Combine like terms: 5x + -24x = -19x
(-30 + -19x + 4x2) = 7

Solving
-30 + -19x + 4x2 = 7

Solving for variable 'x'.

Reorder the terms:
-30 + -7 + -19x + 4x2 = 7 + -7

Combine like terms: -30 + -7 = -37
-37 + -19x + 4x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-37 + -19x + 4x2 = 0

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

Divide each side by '4'.
-9.25 + -4.75x + x2 = 0

Move the constant term to the right:

Add '9.25' to each side of the equation.
-9.25 + -4.75x + 9.25 + x2 = 0 + 9.25

Reorder the terms:
-9.25 + 9.25 + -4.75x + x2 = 0 + 9.25

Combine like terms: -9.25 + 9.25 = 0.00
0.00 + -4.75x + x2 = 0 + 9.25
-4.75x + x2 = 0 + 9.25

Combine like terms: 0 + 9.25 = 9.25
-4.75x + x2 = 9.25

The x term is -4.75x.  Take half its coefficient (-2.375).
Square it (5.640625) and add it to both sides.

Add '5.640625' to each side of the equation.
-4.75x + 5.640625 + x2 = 9.25 + 5.640625

Reorder the terms:
5.640625 + -4.75x + x2 = 9.25 + 5.640625

Combine like terms: 9.25 + 5.640625 = 14.890625
5.640625 + -4.75x + x2 = 14.890625

Factor a perfect square on the left side:
(x + -2.375)(x + -2.375) = 14.890625

Calculate the square root of the right side: 3.85883726

Break this problem into two subproblems by setting 
(x + -2.375) equal to 3.85883726 and -3.85883726.

Subproblem 1

x + -2.375 = 3.85883726 Simplifying x + -2.375 = 3.85883726 Reorder the terms: -2.375 + x = 3.85883726 Solving -2.375 + x = 3.85883726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.375' to each side of the equation. -2.375 + 2.375 + x = 3.85883726 + 2.375 Combine like terms: -2.375 + 2.375 = 0.000 0.000 + x = 3.85883726 + 2.375 x = 3.85883726 + 2.375 Combine like terms: 3.85883726 + 2.375 = 6.23383726 x = 6.23383726 Simplifying x = 6.23383726

Subproblem 2

x + -2.375 = -3.85883726 Simplifying x + -2.375 = -3.85883726 Reorder the terms: -2.375 + x = -3.85883726 Solving -2.375 + x = -3.85883726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.375' to each side of the equation. -2.375 + 2.375 + x = -3.85883726 + 2.375 Combine like terms: -2.375 + 2.375 = 0.000 0.000 + x = -3.85883726 + 2.375 x = -3.85883726 + 2.375 Combine like terms: -3.85883726 + 2.375 = -1.48383726 x = -1.48383726 Simplifying x = -1.48383726

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.23383726, -1.48383726}

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