2x^2+3x=624

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Solution for 2x^2+3x=624 equation:


Simplifying
2x2 + 3x = 624

Reorder the terms:
3x + 2x2 = 624

Solving
3x + 2x2 = 624

Solving for variable 'x'.

Reorder the terms:
-624 + 3x + 2x2 = 624 + -624

Combine like terms: 624 + -624 = 0
-624 + 3x + 2x2 = 0

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

Divide each side by '2'.
-312 + 1.5x + x2 = 0

Move the constant term to the right:

Add '312' to each side of the equation.
-312 + 1.5x + 312 + x2 = 0 + 312

Reorder the terms:
-312 + 312 + 1.5x + x2 = 0 + 312

Combine like terms: -312 + 312 = 0
0 + 1.5x + x2 = 0 + 312
1.5x + x2 = 0 + 312

Combine like terms: 0 + 312 = 312
1.5x + x2 = 312

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 = 312 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 312 + 0.5625

Combine like terms: 312 + 0.5625 = 312.5625
0.5625 + 1.5x + x2 = 312.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 312.5625

Calculate the square root of the right side: 17.679437208

Break this problem into two subproblems by setting 
(x + 0.75) equal to 17.679437208 and -17.679437208.

Subproblem 1

x + 0.75 = 17.679437208 Simplifying x + 0.75 = 17.679437208 Reorder the terms: 0.75 + x = 17.679437208 Solving 0.75 + x = 17.679437208 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 = 17.679437208 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 17.679437208 + -0.75 x = 17.679437208 + -0.75 Combine like terms: 17.679437208 + -0.75 = 16.929437208 x = 16.929437208 Simplifying x = 16.929437208

Subproblem 2

x + 0.75 = -17.679437208 Simplifying x + 0.75 = -17.679437208 Reorder the terms: 0.75 + x = -17.679437208 Solving 0.75 + x = -17.679437208 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 = -17.679437208 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -17.679437208 + -0.75 x = -17.679437208 + -0.75 Combine like terms: -17.679437208 + -0.75 = -18.429437208 x = -18.429437208 Simplifying x = -18.429437208

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.929437208, -18.429437208}

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