x^2+10x-84=0

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Solution for x^2+10x-84=0 equation:


Simplifying
x2 + 10x + -84 = 0

Reorder the terms:
-84 + 10x + x2 = 0

Solving
-84 + 10x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '84' to each side of the equation.
-84 + 10x + 84 + x2 = 0 + 84

Reorder the terms:
-84 + 84 + 10x + x2 = 0 + 84

Combine like terms: -84 + 84 = 0
0 + 10x + x2 = 0 + 84
10x + x2 = 0 + 84

Combine like terms: 0 + 84 = 84
10x + x2 = 84

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 84 + 25

Reorder the terms:
25 + 10x + x2 = 84 + 25

Combine like terms: 84 + 25 = 109
25 + 10x + x2 = 109

Factor a perfect square on the left side:
(x + 5)(x + 5) = 109

Calculate the square root of the right side: 10.440306509

Break this problem into two subproblems by setting 
(x + 5) equal to 10.440306509 and -10.440306509.

Subproblem 1

x + 5 = 10.440306509 Simplifying x + 5 = 10.440306509 Reorder the terms: 5 + x = 10.440306509 Solving 5 + x = 10.440306509 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 10.440306509 + -5 Combine like terms: 5 + -5 = 0 0 + x = 10.440306509 + -5 x = 10.440306509 + -5 Combine like terms: 10.440306509 + -5 = 5.440306509 x = 5.440306509 Simplifying x = 5.440306509

Subproblem 2

x + 5 = -10.440306509 Simplifying x + 5 = -10.440306509 Reorder the terms: 5 + x = -10.440306509 Solving 5 + x = -10.440306509 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -10.440306509 + -5 Combine like terms: 5 + -5 = 0 0 + x = -10.440306509 + -5 x = -10.440306509 + -5 Combine like terms: -10.440306509 + -5 = -15.440306509 x = -15.440306509 Simplifying x = -15.440306509

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.440306509, -15.440306509}

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