10x^2+27x=-16

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Solution for 10x^2+27x=-16 equation:


Simplifying
10x2 + 27x = -16

Reorder the terms:
27x + 10x2 = -16

Solving
27x + 10x2 = -16

Solving for variable 'x'.

Reorder the terms:
16 + 27x + 10x2 = -16 + 16

Combine like terms: -16 + 16 = 0
16 + 27x + 10x2 = 0

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

Divide each side by '10'.
1.6 + 2.7x + x2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + 2.7x + -1.6 + x2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + 2.7x + x2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + 2.7x + x2 = 0 + -1.6
2.7x + x2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
2.7x + x2 = -1.6

The x term is 2.7x.  Take half its coefficient (1.35).
Square it (1.8225) and add it to both sides.

Add '1.8225' to each side of the equation.
2.7x + 1.8225 + x2 = -1.6 + 1.8225

Reorder the terms:
1.8225 + 2.7x + x2 = -1.6 + 1.8225

Combine like terms: -1.6 + 1.8225 = 0.2225
1.8225 + 2.7x + x2 = 0.2225

Factor a perfect square on the left side:
(x + 1.35)(x + 1.35) = 0.2225

Calculate the square root of the right side: 0.471699057

Break this problem into two subproblems by setting 
(x + 1.35) equal to 0.471699057 and -0.471699057.

Subproblem 1

x + 1.35 = 0.471699057 Simplifying x + 1.35 = 0.471699057 Reorder the terms: 1.35 + x = 0.471699057 Solving 1.35 + x = 0.471699057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.35' to each side of the equation. 1.35 + -1.35 + x = 0.471699057 + -1.35 Combine like terms: 1.35 + -1.35 = 0.00 0.00 + x = 0.471699057 + -1.35 x = 0.471699057 + -1.35 Combine like terms: 0.471699057 + -1.35 = -0.878300943 x = -0.878300943 Simplifying x = -0.878300943

Subproblem 2

x + 1.35 = -0.471699057 Simplifying x + 1.35 = -0.471699057 Reorder the terms: 1.35 + x = -0.471699057 Solving 1.35 + x = -0.471699057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.35' to each side of the equation. 1.35 + -1.35 + x = -0.471699057 + -1.35 Combine like terms: 1.35 + -1.35 = 0.00 0.00 + x = -0.471699057 + -1.35 x = -0.471699057 + -1.35 Combine like terms: -0.471699057 + -1.35 = -1.821699057 x = -1.821699057 Simplifying x = -1.821699057

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.878300943, -1.821699057}

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