7x^2+84x-14400=0

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Solution for 7x^2+84x-14400=0 equation:


Simplifying
7x2 + 84x + -14400 = 0

Reorder the terms:
-14400 + 84x + 7x2 = 0

Solving
-14400 + 84x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
-2057.142857 + 12x + x2 = 0

Move the constant term to the right:

Add '2057.142857' to each side of the equation.
-2057.142857 + 12x + 2057.142857 + x2 = 0 + 2057.142857

Reorder the terms:
-2057.142857 + 2057.142857 + 12x + x2 = 0 + 2057.142857

Combine like terms: -2057.142857 + 2057.142857 = 0.000000
0.000000 + 12x + x2 = 0 + 2057.142857
12x + x2 = 0 + 2057.142857

Combine like terms: 0 + 2057.142857 = 2057.142857
12x + x2 = 2057.142857

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 2057.142857 + 36

Reorder the terms:
36 + 12x + x2 = 2057.142857 + 36

Combine like terms: 2057.142857 + 36 = 2093.142857
36 + 12x + x2 = 2093.142857

Factor a perfect square on the left side:
(x + 6)(x + 6) = 2093.142857

Calculate the square root of the right side: 45.75087821

Break this problem into two subproblems by setting 
(x + 6) equal to 45.75087821 and -45.75087821.

Subproblem 1

x + 6 = 45.75087821 Simplifying x + 6 = 45.75087821 Reorder the terms: 6 + x = 45.75087821 Solving 6 + x = 45.75087821 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 45.75087821 + -6 Combine like terms: 6 + -6 = 0 0 + x = 45.75087821 + -6 x = 45.75087821 + -6 Combine like terms: 45.75087821 + -6 = 39.75087821 x = 39.75087821 Simplifying x = 39.75087821

Subproblem 2

x + 6 = -45.75087821 Simplifying x + 6 = -45.75087821 Reorder the terms: 6 + x = -45.75087821 Solving 6 + x = -45.75087821 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -45.75087821 + -6 Combine like terms: 6 + -6 = 0 0 + x = -45.75087821 + -6 x = -45.75087821 + -6 Combine like terms: -45.75087821 + -6 = -51.75087821 x = -51.75087821 Simplifying x = -51.75087821

Solution

The solution to the problem is based on the solutions from the subproblems. x = {39.75087821, -51.75087821}

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