5x^2+16x-15=0

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Solution for 5x^2+16x-15=0 equation:


Simplifying
5x2 + 16x + -15 = 0

Reorder the terms:
-15 + 16x + 5x2 = 0

Solving
-15 + 16x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-3 + 3.2x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 3.2x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 3.2x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 3.2x + x2 = 0 + 3
3.2x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
3.2x + x2 = 3

The x term is 3.2x.  Take half its coefficient (1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
3.2x + 2.56 + x2 = 3 + 2.56

Reorder the terms:
2.56 + 3.2x + x2 = 3 + 2.56

Combine like terms: 3 + 2.56 = 5.56
2.56 + 3.2x + x2 = 5.56

Factor a perfect square on the left side:
(x + 1.6)(x + 1.6) = 5.56

Calculate the square root of the right side: 2.357965225

Break this problem into two subproblems by setting 
(x + 1.6) equal to 2.357965225 and -2.357965225.

Subproblem 1

x + 1.6 = 2.357965225 Simplifying x + 1.6 = 2.357965225 Reorder the terms: 1.6 + x = 2.357965225 Solving 1.6 + x = 2.357965225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x = 2.357965225 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x = 2.357965225 + -1.6 x = 2.357965225 + -1.6 Combine like terms: 2.357965225 + -1.6 = 0.757965225 x = 0.757965225 Simplifying x = 0.757965225

Subproblem 2

x + 1.6 = -2.357965225 Simplifying x + 1.6 = -2.357965225 Reorder the terms: 1.6 + x = -2.357965225 Solving 1.6 + x = -2.357965225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x = -2.357965225 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x = -2.357965225 + -1.6 x = -2.357965225 + -1.6 Combine like terms: -2.357965225 + -1.6 = -3.957965225 x = -3.957965225 Simplifying x = -3.957965225

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.757965225, -3.957965225}

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