5.76X^2+2.86X-1.35=8

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Solution for 5.76X^2+2.86X-1.35=8 equation:


Simplifying
5.76X2 + 2.86X + -1.35 = 8

Reorder the terms:
-1.35 + 2.86X + 5.76X2 = 8

Solving
-1.35 + 2.86X + 5.76X2 = 8

Solving for variable 'X'.

Reorder the terms:
-1.35 + -8 + 2.86X + 5.76X2 = 8 + -8

Combine like terms: -1.35 + -8 = -9.35
-9.35 + 2.86X + 5.76X2 = 8 + -8

Combine like terms: 8 + -8 = 0
-9.35 + 2.86X + 5.76X2 = 0

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

Divide each side by '5.76'.
-1.623263889 + 0.4965277778X + X2 = 0

Move the constant term to the right:

Add '1.623263889' to each side of the equation.
-1.623263889 + 0.4965277778X + 1.623263889 + X2 = 0 + 1.623263889

Reorder the terms:
-1.623263889 + 1.623263889 + 0.4965277778X + X2 = 0 + 1.623263889

Combine like terms: -1.623263889 + 1.623263889 = 0.000000000
0.000000000 + 0.4965277778X + X2 = 0 + 1.623263889
0.4965277778X + X2 = 0 + 1.623263889

Combine like terms: 0 + 1.623263889 = 1.623263889
0.4965277778X + X2 = 1.623263889

The X term is 0.4965277778X.  Take half its coefficient (0.2482638889).
Square it (0.06163495853) and add it to both sides.

Add '0.06163495853' to each side of the equation.
0.4965277778X + 0.06163495853 + X2 = 1.623263889 + 0.06163495853

Reorder the terms:
0.06163495853 + 0.4965277778X + X2 = 1.623263889 + 0.06163495853

Combine like terms: 1.623263889 + 0.06163495853 = 1.68489884753
0.06163495853 + 0.4965277778X + X2 = 1.68489884753

Factor a perfect square on the left side:
(X + 0.2482638889)(X + 0.2482638889) = 1.68489884753

Calculate the square root of the right side: 1.298036536

Break this problem into two subproblems by setting 
(X + 0.2482638889) equal to 1.298036536 and -1.298036536.

Subproblem 1

X + 0.2482638889 = 1.298036536 Simplifying X + 0.2482638889 = 1.298036536 Reorder the terms: 0.2482638889 + X = 1.298036536 Solving 0.2482638889 + X = 1.298036536 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.2482638889' to each side of the equation. 0.2482638889 + -0.2482638889 + X = 1.298036536 + -0.2482638889 Combine like terms: 0.2482638889 + -0.2482638889 = 0.0000000000 0.0000000000 + X = 1.298036536 + -0.2482638889 X = 1.298036536 + -0.2482638889 Combine like terms: 1.298036536 + -0.2482638889 = 1.0497726471 X = 1.0497726471 Simplifying X = 1.0497726471

Subproblem 2

X + 0.2482638889 = -1.298036536 Simplifying X + 0.2482638889 = -1.298036536 Reorder the terms: 0.2482638889 + X = -1.298036536 Solving 0.2482638889 + X = -1.298036536 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.2482638889' to each side of the equation. 0.2482638889 + -0.2482638889 + X = -1.298036536 + -0.2482638889 Combine like terms: 0.2482638889 + -0.2482638889 = 0.0000000000 0.0000000000 + X = -1.298036536 + -0.2482638889 X = -1.298036536 + -0.2482638889 Combine like terms: -1.298036536 + -0.2482638889 = -1.5463004249 X = -1.5463004249 Simplifying X = -1.5463004249

Solution

The solution to the problem is based on the solutions from the subproblems. X = {1.0497726471, -1.5463004249}

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