2x^2+3x=28

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Solution for 2x^2+3x=28 equation:


Simplifying
2x2 + 3x = 28

Reorder the terms:
3x + 2x2 = 28

Solving
3x + 2x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + 3x + 2x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + 3x + 2x2 = 0

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

Divide each side by '2'.
-14 + 1.5x + x2 = 0

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + 1.5x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + 1.5x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 1.5x + x2 = 0 + 14
1.5x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
1.5x + x2 = 14

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 14 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 14 + 0.5625

Combine like terms: 14 + 0.5625 = 14.5625
0.5625 + 1.5x + x2 = 14.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 14.5625

Calculate the square root of the right side: 3.816084381

Break this problem into two subproblems by setting 
(x + 0.75) equal to 3.816084381 and -3.816084381.

Subproblem 1

x + 0.75 = 3.816084381 Simplifying x + 0.75 = 3.816084381 Reorder the terms: 0.75 + x = 3.816084381 Solving 0.75 + x = 3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 3.816084381 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 3.816084381 + -0.75 x = 3.816084381 + -0.75 Combine like terms: 3.816084381 + -0.75 = 3.066084381 x = 3.066084381 Simplifying x = 3.066084381

Subproblem 2

x + 0.75 = -3.816084381 Simplifying x + 0.75 = -3.816084381 Reorder the terms: 0.75 + x = -3.816084381 Solving 0.75 + x = -3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -3.816084381 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -3.816084381 + -0.75 x = -3.816084381 + -0.75 Combine like terms: -3.816084381 + -0.75 = -4.566084381 x = -4.566084381 Simplifying x = -4.566084381

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.066084381, -4.566084381}

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