2x+4x^2=5

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Solution for 2x+4x^2=5 equation:


Simplifying
2x + 4x2 = 5

Solving
2x + 4x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + 2x + 4x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 2x + 4x2 = 0

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

Divide each side by '4'.
-1.25 + 0.5x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 0.5x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 0.5x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 0.5x + x2 = 0 + 1.25
0.5x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
0.5x + x2 = 1.25

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 = 1.25 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 1.25 + 0.0625

Combine like terms: 1.25 + 0.0625 = 1.3125
0.0625 + 0.5x + x2 = 1.3125

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 1.3125

Calculate the square root of the right side: 1.145643924

Break this problem into two subproblems by setting 
(x + 0.25) equal to 1.145643924 and -1.145643924.

Subproblem 1

x + 0.25 = 1.145643924 Simplifying x + 0.25 = 1.145643924 Reorder the terms: 0.25 + x = 1.145643924 Solving 0.25 + x = 1.145643924 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 = 1.145643924 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 1.145643924 + -0.25 x = 1.145643924 + -0.25 Combine like terms: 1.145643924 + -0.25 = 0.895643924 x = 0.895643924 Simplifying x = 0.895643924

Subproblem 2

x + 0.25 = -1.145643924 Simplifying x + 0.25 = -1.145643924 Reorder the terms: 0.25 + x = -1.145643924 Solving 0.25 + x = -1.145643924 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 = -1.145643924 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -1.145643924 + -0.25 x = -1.145643924 + -0.25 Combine like terms: -1.145643924 + -0.25 = -1.395643924 x = -1.395643924 Simplifying x = -1.395643924

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.895643924, -1.395643924}

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