2x(4x+5)=27

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Solution for 2x(4x+5)=27 equation:


Simplifying
2x(4x + 5) = 27

Reorder the terms:
2x(5 + 4x) = 27
(5 * 2x + 4x * 2x) = 27
(10x + 8x2) = 27

Solving
10x + 8x2 = 27

Solving for variable 'x'.

Reorder the terms:
-27 + 10x + 8x2 = 27 + -27

Combine like terms: 27 + -27 = 0
-27 + 10x + 8x2 = 0

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

Divide each side by '8'.
-3.375 + 1.25x + x2 = 0

Move the constant term to the right:

Add '3.375' to each side of the equation.
-3.375 + 1.25x + 3.375 + x2 = 0 + 3.375

Reorder the terms:
-3.375 + 3.375 + 1.25x + x2 = 0 + 3.375

Combine like terms: -3.375 + 3.375 = 0.000
0.000 + 1.25x + x2 = 0 + 3.375
1.25x + x2 = 0 + 3.375

Combine like terms: 0 + 3.375 = 3.375
1.25x + x2 = 3.375

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 3.375 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 3.375 + 0.390625

Combine like terms: 3.375 + 0.390625 = 3.765625
0.390625 + 1.25x + x2 = 3.765625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 3.765625

Calculate the square root of the right side: 1.940521837

Break this problem into two subproblems by setting 
(x + 0.625) equal to 1.940521837 and -1.940521837.

Subproblem 1

x + 0.625 = 1.940521837 Simplifying x + 0.625 = 1.940521837 Reorder the terms: 0.625 + x = 1.940521837 Solving 0.625 + x = 1.940521837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 1.940521837 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 1.940521837 + -0.625 x = 1.940521837 + -0.625 Combine like terms: 1.940521837 + -0.625 = 1.315521837 x = 1.315521837 Simplifying x = 1.315521837

Subproblem 2

x + 0.625 = -1.940521837 Simplifying x + 0.625 = -1.940521837 Reorder the terms: 0.625 + x = -1.940521837 Solving 0.625 + x = -1.940521837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -1.940521837 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -1.940521837 + -0.625 x = -1.940521837 + -0.625 Combine like terms: -1.940521837 + -0.625 = -2.565521837 x = -2.565521837 Simplifying x = -2.565521837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.315521837, -2.565521837}

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