x^2-2x-70=0

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Solution for x^2-2x-70=0 equation:


Simplifying
x2 + -2x + -70 = 0

Reorder the terms:
-70 + -2x + x2 = 0

Solving
-70 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '70' to each side of the equation.
-70 + -2x + 70 + x2 = 0 + 70

Reorder the terms:
-70 + 70 + -2x + x2 = 0 + 70

Combine like terms: -70 + 70 = 0
0 + -2x + x2 = 0 + 70
-2x + x2 = 0 + 70

Combine like terms: 0 + 70 = 70
-2x + x2 = 70

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 70 + 1

Reorder the terms:
1 + -2x + x2 = 70 + 1

Combine like terms: 70 + 1 = 71
1 + -2x + x2 = 71

Factor a perfect square on the left side:
(x + -1)(x + -1) = 71

Calculate the square root of the right side: 8.426149773

Break this problem into two subproblems by setting 
(x + -1) equal to 8.426149773 and -8.426149773.

Subproblem 1

x + -1 = 8.426149773 Simplifying x + -1 = 8.426149773 Reorder the terms: -1 + x = 8.426149773 Solving -1 + x = 8.426149773 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 8.426149773 + 1 Combine like terms: -1 + 1 = 0 0 + x = 8.426149773 + 1 x = 8.426149773 + 1 Combine like terms: 8.426149773 + 1 = 9.426149773 x = 9.426149773 Simplifying x = 9.426149773

Subproblem 2

x + -1 = -8.426149773 Simplifying x + -1 = -8.426149773 Reorder the terms: -1 + x = -8.426149773 Solving -1 + x = -8.426149773 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -8.426149773 + 1 Combine like terms: -1 + 1 = 0 0 + x = -8.426149773 + 1 x = -8.426149773 + 1 Combine like terms: -8.426149773 + 1 = -7.426149773 x = -7.426149773 Simplifying x = -7.426149773

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.426149773, -7.426149773}

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