2x^2+5x+3=8

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Solution for 2x^2+5x+3=8 equation:


Simplifying
2x2 + 5x + 3 = 8

Reorder the terms:
3 + 5x + 2x2 = 8

Solving
3 + 5x + 2x2 = 8

Solving for variable 'x'.

Reorder the terms:
3 + -8 + 5x + 2x2 = 8 + -8

Combine like terms: 3 + -8 = -5
-5 + 5x + 2x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-5 + 5x + 2x2 = 0

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

Divide each side by '2'.
-2.5 + 2.5x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 2.5x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 2.5x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 2.5x + x2 = 0 + 2.5
2.5x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
2.5x + x2 = 2.5

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 2.5 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 2.5 + 1.5625

Combine like terms: 2.5 + 1.5625 = 4.0625
1.5625 + 2.5x + x2 = 4.0625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 4.0625

Calculate the square root of the right side: 2.015564437

Break this problem into two subproblems by setting 
(x + 1.25) equal to 2.015564437 and -2.015564437.

Subproblem 1

x + 1.25 = 2.015564437 Simplifying x + 1.25 = 2.015564437 Reorder the terms: 1.25 + x = 2.015564437 Solving 1.25 + x = 2.015564437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 2.015564437 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 2.015564437 + -1.25 x = 2.015564437 + -1.25 Combine like terms: 2.015564437 + -1.25 = 0.765564437 x = 0.765564437 Simplifying x = 0.765564437

Subproblem 2

x + 1.25 = -2.015564437 Simplifying x + 1.25 = -2.015564437 Reorder the terms: 1.25 + x = -2.015564437 Solving 1.25 + x = -2.015564437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -2.015564437 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -2.015564437 + -1.25 x = -2.015564437 + -1.25 Combine like terms: -2.015564437 + -1.25 = -3.265564437 x = -3.265564437 Simplifying x = -3.265564437

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.765564437, -3.265564437}

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