x^2+18x+35=7

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Solution for x^2+18x+35=7 equation:


Simplifying
x2 + 18x + 35 = 7

Reorder the terms:
35 + 18x + x2 = 7

Solving
35 + 18x + x2 = 7

Solving for variable 'x'.

Reorder the terms:
35 + -7 + 18x + x2 = 7 + -7

Combine like terms: 35 + -7 = 28
28 + 18x + x2 = 7 + -7

Combine like terms: 7 + -7 = 0
28 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-28' to each side of the equation.
28 + 18x + -28 + x2 = 0 + -28

Reorder the terms:
28 + -28 + 18x + x2 = 0 + -28

Combine like terms: 28 + -28 = 0
0 + 18x + x2 = 0 + -28
18x + x2 = 0 + -28

Combine like terms: 0 + -28 = -28
18x + x2 = -28

The x term is 18x.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18x + 81 + x2 = -28 + 81

Reorder the terms:
81 + 18x + x2 = -28 + 81

Combine like terms: -28 + 81 = 53
81 + 18x + x2 = 53

Factor a perfect square on the left side:
(x + 9)(x + 9) = 53

Calculate the square root of the right side: 7.280109889

Break this problem into two subproblems by setting 
(x + 9) equal to 7.280109889 and -7.280109889.

Subproblem 1

x + 9 = 7.280109889 Simplifying x + 9 = 7.280109889 Reorder the terms: 9 + x = 7.280109889 Solving 9 + x = 7.280109889 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 7.280109889 + -9 Combine like terms: 9 + -9 = 0 0 + x = 7.280109889 + -9 x = 7.280109889 + -9 Combine like terms: 7.280109889 + -9 = -1.719890111 x = -1.719890111 Simplifying x = -1.719890111

Subproblem 2

x + 9 = -7.280109889 Simplifying x + 9 = -7.280109889 Reorder the terms: 9 + x = -7.280109889 Solving 9 + x = -7.280109889 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -7.280109889 + -9 Combine like terms: 9 + -9 = 0 0 + x = -7.280109889 + -9 x = -7.280109889 + -9 Combine like terms: -7.280109889 + -9 = -16.280109889 x = -16.280109889 Simplifying x = -16.280109889

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.719890111, -16.280109889}

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