2x^2+15x-48=0

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Solution for 2x^2+15x-48=0 equation:


Simplifying
2x2 + 15x + -48 = 0

Reorder the terms:
-48 + 15x + 2x2 = 0

Solving
-48 + 15x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-24 + 7.5x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 7.5x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + 7.5x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 7.5x + x2 = 0 + 24
7.5x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
7.5x + x2 = 24

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 = 24 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = 24 + 14.0625

Combine like terms: 24 + 14.0625 = 38.0625
14.0625 + 7.5x + x2 = 38.0625

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 38.0625

Calculate the square root of the right side: 6.16948134

Break this problem into two subproblems by setting 
(x + 3.75) equal to 6.16948134 and -6.16948134.

Subproblem 1

x + 3.75 = 6.16948134 Simplifying x + 3.75 = 6.16948134 Reorder the terms: 3.75 + x = 6.16948134 Solving 3.75 + x = 6.16948134 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 = 6.16948134 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 6.16948134 + -3.75 x = 6.16948134 + -3.75 Combine like terms: 6.16948134 + -3.75 = 2.41948134 x = 2.41948134 Simplifying x = 2.41948134

Subproblem 2

x + 3.75 = -6.16948134 Simplifying x + 3.75 = -6.16948134 Reorder the terms: 3.75 + x = -6.16948134 Solving 3.75 + x = -6.16948134 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 = -6.16948134 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -6.16948134 + -3.75 x = -6.16948134 + -3.75 Combine like terms: -6.16948134 + -3.75 = -9.91948134 x = -9.91948134 Simplifying x = -9.91948134

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.41948134, -9.91948134}

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