2x^2+35x=-15

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Solution for 2x^2+35x=-15 equation:


Simplifying
2x2 + 35x = -15

Reorder the terms:
35x + 2x2 = -15

Solving
35x + 2x2 = -15

Solving for variable 'x'.

Reorder the terms:
15 + 35x + 2x2 = -15 + 15

Combine like terms: -15 + 15 = 0
15 + 35x + 2x2 = 0

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

Divide each side by '2'.
7.5 + 17.5x + x2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + 17.5x + -7.5 + x2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + 17.5x + x2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + 17.5x + x2 = 0 + -7.5
17.5x + x2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
17.5x + x2 = -7.5

The x term is 17.5x.  Take half its coefficient (8.75).
Square it (76.5625) and add it to both sides.

Add '76.5625' to each side of the equation.
17.5x + 76.5625 + x2 = -7.5 + 76.5625

Reorder the terms:
76.5625 + 17.5x + x2 = -7.5 + 76.5625

Combine like terms: -7.5 + 76.5625 = 69.0625
76.5625 + 17.5x + x2 = 69.0625

Factor a perfect square on the left side:
(x + 8.75)(x + 8.75) = 69.0625

Calculate the square root of the right side: 8.310385069

Break this problem into two subproblems by setting 
(x + 8.75) equal to 8.310385069 and -8.310385069.

Subproblem 1

x + 8.75 = 8.310385069 Simplifying x + 8.75 = 8.310385069 Reorder the terms: 8.75 + x = 8.310385069 Solving 8.75 + x = 8.310385069 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.75' to each side of the equation. 8.75 + -8.75 + x = 8.310385069 + -8.75 Combine like terms: 8.75 + -8.75 = 0.00 0.00 + x = 8.310385069 + -8.75 x = 8.310385069 + -8.75 Combine like terms: 8.310385069 + -8.75 = -0.439614931 x = -0.439614931 Simplifying x = -0.439614931

Subproblem 2

x + 8.75 = -8.310385069 Simplifying x + 8.75 = -8.310385069 Reorder the terms: 8.75 + x = -8.310385069 Solving 8.75 + x = -8.310385069 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.75' to each side of the equation. 8.75 + -8.75 + x = -8.310385069 + -8.75 Combine like terms: 8.75 + -8.75 = 0.00 0.00 + x = -8.310385069 + -8.75 x = -8.310385069 + -8.75 Combine like terms: -8.310385069 + -8.75 = -17.060385069 x = -17.060385069 Simplifying x = -17.060385069

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.439614931, -17.060385069}

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