-5x^2-24x+51=0

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Solution for -5x^2-24x+51=0 equation:


Simplifying
-5x2 + -24x + 51 = 0

Reorder the terms:
51 + -24x + -5x2 = 0

Solving
51 + -24x + -5x2 = 0

Solving for variable 'x'.

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

Divide each side by '-5'.
-10.2 + 4.8x + x2 = 0

Move the constant term to the right:

Add '10.2' to each side of the equation.
-10.2 + 4.8x + 10.2 + x2 = 0 + 10.2

Reorder the terms:
-10.2 + 10.2 + 4.8x + x2 = 0 + 10.2

Combine like terms: -10.2 + 10.2 = 0.0
0.0 + 4.8x + x2 = 0 + 10.2
4.8x + x2 = 0 + 10.2

Combine like terms: 0 + 10.2 = 10.2
4.8x + x2 = 10.2

The x term is 4.8x.  Take half its coefficient (2.4).
Square it (5.76) and add it to both sides.

Add '5.76' to each side of the equation.
4.8x + 5.76 + x2 = 10.2 + 5.76

Reorder the terms:
5.76 + 4.8x + x2 = 10.2 + 5.76

Combine like terms: 10.2 + 5.76 = 15.96
5.76 + 4.8x + x2 = 15.96

Factor a perfect square on the left side:
(x + 2.4)(x + 2.4) = 15.96

Calculate the square root of the right side: 3.994996871

Break this problem into two subproblems by setting 
(x + 2.4) equal to 3.994996871 and -3.994996871.

Subproblem 1

x + 2.4 = 3.994996871 Simplifying x + 2.4 = 3.994996871 Reorder the terms: 2.4 + x = 3.994996871 Solving 2.4 + x = 3.994996871 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + x = 3.994996871 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + x = 3.994996871 + -2.4 x = 3.994996871 + -2.4 Combine like terms: 3.994996871 + -2.4 = 1.594996871 x = 1.594996871 Simplifying x = 1.594996871

Subproblem 2

x + 2.4 = -3.994996871 Simplifying x + 2.4 = -3.994996871 Reorder the terms: 2.4 + x = -3.994996871 Solving 2.4 + x = -3.994996871 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + x = -3.994996871 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + x = -3.994996871 + -2.4 x = -3.994996871 + -2.4 Combine like terms: -3.994996871 + -2.4 = -6.394996871 x = -6.394996871 Simplifying x = -6.394996871

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.594996871, -6.394996871}

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