(4x-5)(x+2)=1

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Solution for (4x-5)(x+2)=1 equation:


Simplifying
(4x + -5)(x + 2) = 1

Reorder the terms:
(-5 + 4x)(x + 2) = 1

Reorder the terms:
(-5 + 4x)(2 + x) = 1

Multiply (-5 + 4x) * (2 + x)
(-5(2 + x) + 4x * (2 + x)) = 1
((2 * -5 + x * -5) + 4x * (2 + x)) = 1
((-10 + -5x) + 4x * (2 + x)) = 1
(-10 + -5x + (2 * 4x + x * 4x)) = 1
(-10 + -5x + (8x + 4x2)) = 1

Combine like terms: -5x + 8x = 3x
(-10 + 3x + 4x2) = 1

Solving
-10 + 3x + 4x2 = 1

Solving for variable 'x'.

Reorder the terms:
-10 + -1 + 3x + 4x2 = 1 + -1

Combine like terms: -10 + -1 = -11
-11 + 3x + 4x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-11 + 3x + 4x2 = 0

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

Divide each side by '4'.
-2.75 + 0.75x + x2 = 0

Move the constant term to the right:

Add '2.75' to each side of the equation.
-2.75 + 0.75x + 2.75 + x2 = 0 + 2.75

Reorder the terms:
-2.75 + 2.75 + 0.75x + x2 = 0 + 2.75

Combine like terms: -2.75 + 2.75 = 0.00
0.00 + 0.75x + x2 = 0 + 2.75
0.75x + x2 = 0 + 2.75

Combine like terms: 0 + 2.75 = 2.75
0.75x + x2 = 2.75

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 2.75 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 2.75 + 0.140625

Combine like terms: 2.75 + 0.140625 = 2.890625
0.140625 + 0.75x + x2 = 2.890625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 2.890625

Calculate the square root of the right side: 1.700183814

Break this problem into two subproblems by setting 
(x + 0.375) equal to 1.700183814 and -1.700183814.

Subproblem 1

x + 0.375 = 1.700183814 Simplifying x + 0.375 = 1.700183814 Reorder the terms: 0.375 + x = 1.700183814 Solving 0.375 + x = 1.700183814 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 1.700183814 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 1.700183814 + -0.375 x = 1.700183814 + -0.375 Combine like terms: 1.700183814 + -0.375 = 1.325183814 x = 1.325183814 Simplifying x = 1.325183814

Subproblem 2

x + 0.375 = -1.700183814 Simplifying x + 0.375 = -1.700183814 Reorder the terms: 0.375 + x = -1.700183814 Solving 0.375 + x = -1.700183814 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -1.700183814 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -1.700183814 + -0.375 x = -1.700183814 + -0.375 Combine like terms: -1.700183814 + -0.375 = -2.075183814 x = -2.075183814 Simplifying x = -2.075183814

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.325183814, -2.075183814}

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