2x^2+5x=252

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Solution for 2x^2+5x=252 equation:


Simplifying
2x2 + 5x = 252

Reorder the terms:
5x + 2x2 = 252

Solving
5x + 2x2 = 252

Solving for variable 'x'.

Reorder the terms:
-252 + 5x + 2x2 = 252 + -252

Combine like terms: 252 + -252 = 0
-252 + 5x + 2x2 = 0

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

Divide each side by '2'.
-126 + 2.5x + x2 = 0

Move the constant term to the right:

Add '126' to each side of the equation.
-126 + 2.5x + 126 + x2 = 0 + 126

Reorder the terms:
-126 + 126 + 2.5x + x2 = 0 + 126

Combine like terms: -126 + 126 = 0
0 + 2.5x + x2 = 0 + 126
2.5x + x2 = 0 + 126

Combine like terms: 0 + 126 = 126
2.5x + x2 = 126

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 = 126 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 126 + 1.5625

Combine like terms: 126 + 1.5625 = 127.5625
1.5625 + 2.5x + x2 = 127.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 127.5625

Calculate the square root of the right side: 11.294356998

Break this problem into two subproblems by setting 
(x + 1.25) equal to 11.294356998 and -11.294356998.

Subproblem 1

x + 1.25 = 11.294356998 Simplifying x + 1.25 = 11.294356998 Reorder the terms: 1.25 + x = 11.294356998 Solving 1.25 + x = 11.294356998 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 = 11.294356998 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 11.294356998 + -1.25 x = 11.294356998 + -1.25 Combine like terms: 11.294356998 + -1.25 = 10.044356998 x = 10.044356998 Simplifying x = 10.044356998

Subproblem 2

x + 1.25 = -11.294356998 Simplifying x + 1.25 = -11.294356998 Reorder the terms: 1.25 + x = -11.294356998 Solving 1.25 + x = -11.294356998 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 = -11.294356998 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -11.294356998 + -1.25 x = -11.294356998 + -1.25 Combine like terms: -11.294356998 + -1.25 = -12.544356998 x = -12.544356998 Simplifying x = -12.544356998

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.044356998, -12.544356998}

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