0=-5x^2-3x+17

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Solution for 0=-5x^2-3x+17 equation:


Simplifying
0 = -5x2 + -3x + 17

Reorder the terms:
0 = 17 + -3x + -5x2

Solving
0 = 17 + -3x + -5x2

Solving for variable 'x'.

Combine like terms: 0 + -17 = -17
-17 + 3x + 5x2 = 17 + -3x + -5x2 + -17 + 3x + 5x2

Reorder the terms:
-17 + 3x + 5x2 = 17 + -17 + -3x + 3x + -5x2 + 5x2

Combine like terms: 17 + -17 = 0
-17 + 3x + 5x2 = 0 + -3x + 3x + -5x2 + 5x2
-17 + 3x + 5x2 = -3x + 3x + -5x2 + 5x2

Combine like terms: -3x + 3x = 0
-17 + 3x + 5x2 = 0 + -5x2 + 5x2
-17 + 3x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
-17 + 3x + 5x2 = 0

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

Divide each side by '5'.
-3.4 + 0.6x + x2 = 0

Move the constant term to the right:

Add '3.4' to each side of the equation.
-3.4 + 0.6x + 3.4 + x2 = 0 + 3.4

Reorder the terms:
-3.4 + 3.4 + 0.6x + x2 = 0 + 3.4

Combine like terms: -3.4 + 3.4 = 0.0
0.0 + 0.6x + x2 = 0 + 3.4
0.6x + x2 = 0 + 3.4

Combine like terms: 0 + 3.4 = 3.4
0.6x + x2 = 3.4

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 3.4 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 3.4 + 0.09

Combine like terms: 3.4 + 0.09 = 3.49
0.09 + 0.6x + x2 = 3.49

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 3.49

Calculate the square root of the right side: 1.868154169

Break this problem into two subproblems by setting 
(x + 0.3) equal to 1.868154169 and -1.868154169.

Subproblem 1

x + 0.3 = 1.868154169 Simplifying x + 0.3 = 1.868154169 Reorder the terms: 0.3 + x = 1.868154169 Solving 0.3 + x = 1.868154169 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 1.868154169 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 1.868154169 + -0.3 x = 1.868154169 + -0.3 Combine like terms: 1.868154169 + -0.3 = 1.568154169 x = 1.568154169 Simplifying x = 1.568154169

Subproblem 2

x + 0.3 = -1.868154169 Simplifying x + 0.3 = -1.868154169 Reorder the terms: 0.3 + x = -1.868154169 Solving 0.3 + x = -1.868154169 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -1.868154169 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -1.868154169 + -0.3 x = -1.868154169 + -0.3 Combine like terms: -1.868154169 + -0.3 = -2.168154169 x = -2.168154169 Simplifying x = -2.168154169

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.568154169, -2.168154169}

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