2x^2+16x-225=0

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Solution for 2x^2+16x-225=0 equation:


Simplifying
2x2 + 16x + -225 = 0

Reorder the terms:
-225 + 16x + 2x2 = 0

Solving
-225 + 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'.
-112.5 + 8x + x2 = 0

Move the constant term to the right:

Add '112.5' to each side of the equation.
-112.5 + 8x + 112.5 + x2 = 0 + 112.5

Reorder the terms:
-112.5 + 112.5 + 8x + x2 = 0 + 112.5

Combine like terms: -112.5 + 112.5 = 0.0
0.0 + 8x + x2 = 0 + 112.5
8x + x2 = 0 + 112.5

Combine like terms: 0 + 112.5 = 112.5
8x + x2 = 112.5

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 = 112.5 + 16

Reorder the terms:
16 + 8x + x2 = 112.5 + 16

Combine like terms: 112.5 + 16 = 128.5
16 + 8x + x2 = 128.5

Factor a perfect square on the left side:
(x + 4)(x + 4) = 128.5

Calculate the square root of the right side: 11.335784049

Break this problem into two subproblems by setting 
(x + 4) equal to 11.335784049 and -11.335784049.

Subproblem 1

x + 4 = 11.335784049 Simplifying x + 4 = 11.335784049 Reorder the terms: 4 + x = 11.335784049 Solving 4 + x = 11.335784049 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 = 11.335784049 + -4 Combine like terms: 4 + -4 = 0 0 + x = 11.335784049 + -4 x = 11.335784049 + -4 Combine like terms: 11.335784049 + -4 = 7.335784049 x = 7.335784049 Simplifying x = 7.335784049

Subproblem 2

x + 4 = -11.335784049 Simplifying x + 4 = -11.335784049 Reorder the terms: 4 + x = -11.335784049 Solving 4 + x = -11.335784049 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 = -11.335784049 + -4 Combine like terms: 4 + -4 = 0 0 + x = -11.335784049 + -4 x = -11.335784049 + -4 Combine like terms: -11.335784049 + -4 = -15.335784049 x = -15.335784049 Simplifying x = -15.335784049

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.335784049, -15.335784049}

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