2x^2+16x-57=0

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Solution for 2x^2+16x-57=0 equation:


Simplifying
2x2 + 16x + -57 = 0

Reorder the terms:
-57 + 16x + 2x2 = 0

Solving
-57 + 16x + 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'.
-28.5 + 8x + x2 = 0

Move the constant term to the right:

Add '28.5' to each side of the equation.
-28.5 + 8x + 28.5 + x2 = 0 + 28.5

Reorder the terms:
-28.5 + 28.5 + 8x + x2 = 0 + 28.5

Combine like terms: -28.5 + 28.5 = 0.0
0.0 + 8x + x2 = 0 + 28.5
8x + x2 = 0 + 28.5

Combine like terms: 0 + 28.5 = 28.5
8x + x2 = 28.5

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 28.5 + 16

Reorder the terms:
16 + 8x + x2 = 28.5 + 16

Combine like terms: 28.5 + 16 = 44.5
16 + 8x + x2 = 44.5

Factor a perfect square on the left side:
(x + 4)(x + 4) = 44.5

Calculate the square root of the right side: 6.670832032

Break this problem into two subproblems by setting 
(x + 4) equal to 6.670832032 and -6.670832032.

Subproblem 1

x + 4 = 6.670832032 Simplifying x + 4 = 6.670832032 Reorder the terms: 4 + x = 6.670832032 Solving 4 + x = 6.670832032 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 6.670832032 + -4 Combine like terms: 4 + -4 = 0 0 + x = 6.670832032 + -4 x = 6.670832032 + -4 Combine like terms: 6.670832032 + -4 = 2.670832032 x = 2.670832032 Simplifying x = 2.670832032

Subproblem 2

x + 4 = -6.670832032 Simplifying x + 4 = -6.670832032 Reorder the terms: 4 + x = -6.670832032 Solving 4 + x = -6.670832032 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -6.670832032 + -4 Combine like terms: 4 + -4 = 0 0 + x = -6.670832032 + -4 x = -6.670832032 + -4 Combine like terms: -6.670832032 + -4 = -10.670832032 x = -10.670832032 Simplifying x = -10.670832032

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.670832032, -10.670832032}

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