x^2+2x-15=270

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Solution for x^2+2x-15=270 equation:


Simplifying
x2 + 2x + -15 = 270

Reorder the terms:
-15 + 2x + x2 = 270

Solving
-15 + 2x + x2 = 270

Solving for variable 'x'.

Reorder the terms:
-15 + -270 + 2x + x2 = 270 + -270

Combine like terms: -15 + -270 = -285
-285 + 2x + x2 = 270 + -270

Combine like terms: 270 + -270 = 0
-285 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '285' to each side of the equation.
-285 + 2x + 285 + x2 = 0 + 285

Reorder the terms:
-285 + 285 + 2x + x2 = 0 + 285

Combine like terms: -285 + 285 = 0
0 + 2x + x2 = 0 + 285
2x + x2 = 0 + 285

Combine like terms: 0 + 285 = 285
2x + x2 = 285

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 = 285 + 1

Reorder the terms:
1 + 2x + x2 = 285 + 1

Combine like terms: 285 + 1 = 286
1 + 2x + x2 = 286

Factor a perfect square on the left side:
(x + 1)(x + 1) = 286

Calculate the square root of the right side: 16.911534525

Break this problem into two subproblems by setting 
(x + 1) equal to 16.911534525 and -16.911534525.

Subproblem 1

x + 1 = 16.911534525 Simplifying x + 1 = 16.911534525 Reorder the terms: 1 + x = 16.911534525 Solving 1 + x = 16.911534525 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 = 16.911534525 + -1 Combine like terms: 1 + -1 = 0 0 + x = 16.911534525 + -1 x = 16.911534525 + -1 Combine like terms: 16.911534525 + -1 = 15.911534525 x = 15.911534525 Simplifying x = 15.911534525

Subproblem 2

x + 1 = -16.911534525 Simplifying x + 1 = -16.911534525 Reorder the terms: 1 + x = -16.911534525 Solving 1 + x = -16.911534525 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 = -16.911534525 + -1 Combine like terms: 1 + -1 = 0 0 + x = -16.911534525 + -1 x = -16.911534525 + -1 Combine like terms: -16.911534525 + -1 = -17.911534525 x = -17.911534525 Simplifying x = -17.911534525

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.911534525, -17.911534525}

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