2x^2+15x=24

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Solution for 2x^2+15x=24 equation:


Simplifying
2x2 + 15x = 24

Reorder the terms:
15x + 2x2 = 24

Solving
15x + 2x2 = 24

Solving for variable 'x'.

Reorder the terms:
-24 + 15x + 2x2 = 24 + -24

Combine like terms: 24 + -24 = 0
-24 + 15x + 2x2 = 0

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

Divide each side by '2'.
-12 + 7.5x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 7.5x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + 7.5x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 7.5x + x2 = 0 + 12
7.5x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
7.5x + x2 = 12

The x term is 7.5x.  Take half its coefficient (3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
7.5x + 14.0625 + x2 = 12 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = 12 + 14.0625

Combine like terms: 12 + 14.0625 = 26.0625
14.0625 + 7.5x + x2 = 26.0625

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 26.0625

Calculate the square root of the right side: 5.105144464

Break this problem into two subproblems by setting 
(x + 3.75) equal to 5.105144464 and -5.105144464.

Subproblem 1

x + 3.75 = 5.105144464 Simplifying x + 3.75 = 5.105144464 Reorder the terms: 3.75 + x = 5.105144464 Solving 3.75 + x = 5.105144464 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = 5.105144464 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 5.105144464 + -3.75 x = 5.105144464 + -3.75 Combine like terms: 5.105144464 + -3.75 = 1.355144464 x = 1.355144464 Simplifying x = 1.355144464

Subproblem 2

x + 3.75 = -5.105144464 Simplifying x + 3.75 = -5.105144464 Reorder the terms: 3.75 + x = -5.105144464 Solving 3.75 + x = -5.105144464 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = -5.105144464 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -5.105144464 + -3.75 x = -5.105144464 + -3.75 Combine like terms: -5.105144464 + -3.75 = -8.855144464 x = -8.855144464 Simplifying x = -8.855144464

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.355144464, -8.855144464}

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