2X(2X+1)-7=0

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Solution for 2X(2X+1)-7=0 equation:


Simplifying
2X(2X + 1) + -7 = 0

Reorder the terms:
2X(1 + 2X) + -7 = 0
(1 * 2X + 2X * 2X) + -7 = 0
(2X + 4X2) + -7 = 0

Reorder the terms:
-7 + 2X + 4X2 = 0

Solving
-7 + 2X + 4X2 = 0

Solving for variable 'X'.

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

Divide each side by '4'.
-1.75 + 0.5X + X2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + 0.5X + 1.75 + X2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + 0.5X + X2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + 0.5X + X2 = 0 + 1.75
0.5X + X2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
0.5X + X2 = 1.75

The X term is 0.5X.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5X + 0.0625 + X2 = 1.75 + 0.0625

Reorder the terms:
0.0625 + 0.5X + X2 = 1.75 + 0.0625

Combine like terms: 1.75 + 0.0625 = 1.8125
0.0625 + 0.5X + X2 = 1.8125

Factor a perfect square on the left side:
(X + 0.25)(X + 0.25) = 1.8125

Calculate the square root of the right side: 1.346291202

Break this problem into two subproblems by setting 
(X + 0.25) equal to 1.346291202 and -1.346291202.

Subproblem 1

X + 0.25 = 1.346291202 Simplifying X + 0.25 = 1.346291202 Reorder the terms: 0.25 + X = 1.346291202 Solving 0.25 + X = 1.346291202 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + X = 1.346291202 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + X = 1.346291202 + -0.25 X = 1.346291202 + -0.25 Combine like terms: 1.346291202 + -0.25 = 1.096291202 X = 1.096291202 Simplifying X = 1.096291202

Subproblem 2

X + 0.25 = -1.346291202 Simplifying X + 0.25 = -1.346291202 Reorder the terms: 0.25 + X = -1.346291202 Solving 0.25 + X = -1.346291202 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + X = -1.346291202 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + X = -1.346291202 + -0.25 X = -1.346291202 + -0.25 Combine like terms: -1.346291202 + -0.25 = -1.596291202 X = -1.596291202 Simplifying X = -1.596291202

Solution

The solution to the problem is based on the solutions from the subproblems. X = {1.096291202, -1.596291202}

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