5x^2-17x-28=0

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Solution for 5x^2-17x-28=0 equation:


Simplifying
5x2 + -17x + -28 = 0

Reorder the terms:
-28 + -17x + 5x2 = 0

Solving
-28 + -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'.
-5.6 + -3.4x + x2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + -3.4x + 5.6 + x2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + -3.4x + x2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + -3.4x + x2 = 0 + 5.6
-3.4x + x2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
-3.4x + x2 = 5.6

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 = 5.6 + 2.89

Reorder the terms:
2.89 + -3.4x + x2 = 5.6 + 2.89

Combine like terms: 5.6 + 2.89 = 8.49
2.89 + -3.4x + x2 = 8.49

Factor a perfect square on the left side:
(x + -1.7)(x + -1.7) = 8.49

Calculate the square root of the right side: 2.913760457

Break this problem into two subproblems by setting 
(x + -1.7) equal to 2.913760457 and -2.913760457.

Subproblem 1

x + -1.7 = 2.913760457 Simplifying x + -1.7 = 2.913760457 Reorder the terms: -1.7 + x = 2.913760457 Solving -1.7 + x = 2.913760457 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 = 2.913760457 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = 2.913760457 + 1.7 x = 2.913760457 + 1.7 Combine like terms: 2.913760457 + 1.7 = 4.613760457 x = 4.613760457 Simplifying x = 4.613760457

Subproblem 2

x + -1.7 = -2.913760457 Simplifying x + -1.7 = -2.913760457 Reorder the terms: -1.7 + x = -2.913760457 Solving -1.7 + x = -2.913760457 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 = -2.913760457 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = -2.913760457 + 1.7 x = -2.913760457 + 1.7 Combine like terms: -2.913760457 + 1.7 = -1.213760457 x = -1.213760457 Simplifying x = -1.213760457

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.613760457, -1.213760457}

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