(4x-1)(2x+5)=7x

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Solution for (4x-1)(2x+5)=7x equation:


Simplifying
(4x + -1)(2x + 5) = 7x

Reorder the terms:
(-1 + 4x)(2x + 5) = 7x

Reorder the terms:
(-1 + 4x)(5 + 2x) = 7x

Multiply (-1 + 4x) * (5 + 2x)
(-1(5 + 2x) + 4x * (5 + 2x)) = 7x
((5 * -1 + 2x * -1) + 4x * (5 + 2x)) = 7x
((-5 + -2x) + 4x * (5 + 2x)) = 7x
(-5 + -2x + (5 * 4x + 2x * 4x)) = 7x
(-5 + -2x + (20x + 8x2)) = 7x

Combine like terms: -2x + 20x = 18x
(-5 + 18x + 8x2) = 7x

Solving
-5 + 18x + 8x2 = 7x

Solving for variable 'x'.

Reorder the terms:
-5 + 18x + -7x + 8x2 = 7x + -7x

Combine like terms: 18x + -7x = 11x
-5 + 11x + 8x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-5 + 11x + 8x2 = 0

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

Divide each side by '8'.
-0.625 + 1.375x + x2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + 1.375x + 0.625 + x2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + 1.375x + x2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + 1.375x + x2 = 0 + 0.625
1.375x + x2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
1.375x + x2 = 0.625

The x term is 1.375x.  Take half its coefficient (0.6875).
Square it (0.47265625) and add it to both sides.

Add '0.47265625' to each side of the equation.
1.375x + 0.47265625 + x2 = 0.625 + 0.47265625

Reorder the terms:
0.47265625 + 1.375x + x2 = 0.625 + 0.47265625

Combine like terms: 0.625 + 0.47265625 = 1.09765625
0.47265625 + 1.375x + x2 = 1.09765625

Factor a perfect square on the left side:
(x + 0.6875)(x + 0.6875) = 1.09765625

Calculate the square root of the right side: 1.047690913

Break this problem into two subproblems by setting 
(x + 0.6875) equal to 1.047690913 and -1.047690913.

Subproblem 1

x + 0.6875 = 1.047690913 Simplifying x + 0.6875 = 1.047690913 Reorder the terms: 0.6875 + x = 1.047690913 Solving 0.6875 + x = 1.047690913 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6875' to each side of the equation. 0.6875 + -0.6875 + x = 1.047690913 + -0.6875 Combine like terms: 0.6875 + -0.6875 = 0.0000 0.0000 + x = 1.047690913 + -0.6875 x = 1.047690913 + -0.6875 Combine like terms: 1.047690913 + -0.6875 = 0.360190913 x = 0.360190913 Simplifying x = 0.360190913

Subproblem 2

x + 0.6875 = -1.047690913 Simplifying x + 0.6875 = -1.047690913 Reorder the terms: 0.6875 + x = -1.047690913 Solving 0.6875 + x = -1.047690913 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6875' to each side of the equation. 0.6875 + -0.6875 + x = -1.047690913 + -0.6875 Combine like terms: 0.6875 + -0.6875 = 0.0000 0.0000 + x = -1.047690913 + -0.6875 x = -1.047690913 + -0.6875 Combine like terms: -1.047690913 + -0.6875 = -1.735190913 x = -1.735190913 Simplifying x = -1.735190913

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.360190913, -1.735190913}

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