10x^2+39x-16=0

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Solution for 10x^2+39x-16=0 equation:


Simplifying
10x2 + 39x + -16 = 0

Reorder the terms:
-16 + 39x + 10x2 = 0

Solving
-16 + 39x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-1.6 + 3.9x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + 3.9x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + 3.9x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + 3.9x + x2 = 0 + 1.6
3.9x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
3.9x + x2 = 1.6

The x term is 3.9x.  Take half its coefficient (1.95).
Square it (3.8025) and add it to both sides.

Add '3.8025' to each side of the equation.
3.9x + 3.8025 + x2 = 1.6 + 3.8025

Reorder the terms:
3.8025 + 3.9x + x2 = 1.6 + 3.8025

Combine like terms: 1.6 + 3.8025 = 5.4025
3.8025 + 3.9x + x2 = 5.4025

Factor a perfect square on the left side:
(x + 1.95)(x + 1.95) = 5.4025

Calculate the square root of the right side: 2.32432786

Break this problem into two subproblems by setting 
(x + 1.95) equal to 2.32432786 and -2.32432786.

Subproblem 1

x + 1.95 = 2.32432786 Simplifying x + 1.95 = 2.32432786 Reorder the terms: 1.95 + x = 2.32432786 Solving 1.95 + x = 2.32432786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.95' to each side of the equation. 1.95 + -1.95 + x = 2.32432786 + -1.95 Combine like terms: 1.95 + -1.95 = 0.00 0.00 + x = 2.32432786 + -1.95 x = 2.32432786 + -1.95 Combine like terms: 2.32432786 + -1.95 = 0.37432786 x = 0.37432786 Simplifying x = 0.37432786

Subproblem 2

x + 1.95 = -2.32432786 Simplifying x + 1.95 = -2.32432786 Reorder the terms: 1.95 + x = -2.32432786 Solving 1.95 + x = -2.32432786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.95' to each side of the equation. 1.95 + -1.95 + x = -2.32432786 + -1.95 Combine like terms: 1.95 + -1.95 = 0.00 0.00 + x = -2.32432786 + -1.95 x = -2.32432786 + -1.95 Combine like terms: -2.32432786 + -1.95 = -4.27432786 x = -4.27432786 Simplifying x = -4.27432786

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.37432786, -4.27432786}

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