5x^2+3x+2=1240

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Solution for 5x^2+3x+2=1240 equation:


Simplifying
5x2 + 3x + 2 = 1240

Reorder the terms:
2 + 3x + 5x2 = 1240

Solving
2 + 3x + 5x2 = 1240

Solving for variable 'x'.

Reorder the terms:
2 + -1240 + 3x + 5x2 = 1240 + -1240

Combine like terms: 2 + -1240 = -1238
-1238 + 3x + 5x2 = 1240 + -1240

Combine like terms: 1240 + -1240 = 0
-1238 + 3x + 5x2 = 0

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

Divide each side by '5'.
-247.6 + 0.6x + x2 = 0

Move the constant term to the right:

Add '247.6' to each side of the equation.
-247.6 + 0.6x + 247.6 + x2 = 0 + 247.6

Reorder the terms:
-247.6 + 247.6 + 0.6x + x2 = 0 + 247.6

Combine like terms: -247.6 + 247.6 = 0.0
0.0 + 0.6x + x2 = 0 + 247.6
0.6x + x2 = 0 + 247.6

Combine like terms: 0 + 247.6 = 247.6
0.6x + x2 = 247.6

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 247.6 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 247.6 + 0.09

Combine like terms: 247.6 + 0.09 = 247.69
0.09 + 0.6x + x2 = 247.69

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 247.69

Calculate the square root of the right side: 15.73817016

Break this problem into two subproblems by setting 
(x + 0.3) equal to 15.73817016 and -15.73817016.

Subproblem 1

x + 0.3 = 15.73817016 Simplifying x + 0.3 = 15.73817016 Reorder the terms: 0.3 + x = 15.73817016 Solving 0.3 + x = 15.73817016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 15.73817016 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 15.73817016 + -0.3 x = 15.73817016 + -0.3 Combine like terms: 15.73817016 + -0.3 = 15.43817016 x = 15.43817016 Simplifying x = 15.43817016

Subproblem 2

x + 0.3 = -15.73817016 Simplifying x + 0.3 = -15.73817016 Reorder the terms: 0.3 + x = -15.73817016 Solving 0.3 + x = -15.73817016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -15.73817016 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -15.73817016 + -0.3 x = -15.73817016 + -0.3 Combine like terms: -15.73817016 + -0.3 = -16.03817016 x = -16.03817016 Simplifying x = -16.03817016

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.43817016, -16.03817016}

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