5x^2+17x-16=0

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Solution for 5x^2+17x-16=0 equation:


Simplifying
5x2 + 17x + -16 = 0

Reorder the terms:
-16 + 17x + 5x2 = 0

Solving
-16 + 17x + 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'.
-3.2 + 3.4x + x2 = 0

Move the constant term to the right:

Add '3.2' to each side of the equation.
-3.2 + 3.4x + 3.2 + x2 = 0 + 3.2

Reorder the terms:
-3.2 + 3.2 + 3.4x + x2 = 0 + 3.2

Combine like terms: -3.2 + 3.2 = 0.0
0.0 + 3.4x + x2 = 0 + 3.2
3.4x + x2 = 0 + 3.2

Combine like terms: 0 + 3.2 = 3.2
3.4x + x2 = 3.2

The x term is 3.4x.  Take half its coefficient (1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
3.4x + 2.89 + x2 = 3.2 + 2.89

Reorder the terms:
2.89 + 3.4x + x2 = 3.2 + 2.89

Combine like terms: 3.2 + 2.89 = 6.09
2.89 + 3.4x + x2 = 6.09

Factor a perfect square on the left side:
(x + 1.7)(x + 1.7) = 6.09

Calculate the square root of the right side: 2.467792536

Break this problem into two subproblems by setting 
(x + 1.7) equal to 2.467792536 and -2.467792536.

Subproblem 1

x + 1.7 = 2.467792536 Simplifying x + 1.7 = 2.467792536 Reorder the terms: 1.7 + x = 2.467792536 Solving 1.7 + x = 2.467792536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + x = 2.467792536 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + x = 2.467792536 + -1.7 x = 2.467792536 + -1.7 Combine like terms: 2.467792536 + -1.7 = 0.767792536 x = 0.767792536 Simplifying x = 0.767792536

Subproblem 2

x + 1.7 = -2.467792536 Simplifying x + 1.7 = -2.467792536 Reorder the terms: 1.7 + x = -2.467792536 Solving 1.7 + x = -2.467792536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + x = -2.467792536 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + x = -2.467792536 + -1.7 x = -2.467792536 + -1.7 Combine like terms: -2.467792536 + -1.7 = -4.167792536 x = -4.167792536 Simplifying x = -4.167792536

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.767792536, -4.167792536}

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