0=2.5x^2-17x-10

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Solution for 0=2.5x^2-17x-10 equation:


Simplifying
0 = 2.5x2 + -17x + -10

Reorder the terms:
0 = -10 + -17x + 2.5x2

Solving
0 = -10 + -17x + 2.5x2

Solving for variable 'x'.

Combine like terms: 0 + 10 = 10
10 + 17x + -2.5x2 = -10 + -17x + 2.5x2 + 10 + 17x + -2.5x2

Reorder the terms:
10 + 17x + -2.5x2 = -10 + 10 + -17x + 17x + 2.5x2 + -2.5x2

Combine like terms: -10 + 10 = 0
10 + 17x + -2.5x2 = 0 + -17x + 17x + 2.5x2 + -2.5x2
10 + 17x + -2.5x2 = -17x + 17x + 2.5x2 + -2.5x2

Combine like terms: -17x + 17x = 0
10 + 17x + -2.5x2 = 0 + 2.5x2 + -2.5x2
10 + 17x + -2.5x2 = 2.5x2 + -2.5x2

Combine like terms: 2.5x2 + -2.5x2 = 0.0
10 + 17x + -2.5x2 = 0.0

Begin completing the square.  Divide all terms by
-2.5 the coefficient of the squared term: 

Divide each side by '-2.5'.
-4 + -6.8x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -6.8x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -6.8x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -6.8x + x2 = 0 + 4
-6.8x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-6.8x + x2 = 4

The x term is -6.8x.  Take half its coefficient (-3.4).
Square it (11.56) and add it to both sides.

Add '11.56' to each side of the equation.
-6.8x + 11.56 + x2 = 4 + 11.56

Reorder the terms:
11.56 + -6.8x + x2 = 4 + 11.56

Combine like terms: 4 + 11.56 = 15.56
11.56 + -6.8x + x2 = 15.56

Factor a perfect square on the left side:
(x + -3.4)(x + -3.4) = 15.56

Calculate the square root of the right side: 3.944616585

Break this problem into two subproblems by setting 
(x + -3.4) equal to 3.944616585 and -3.944616585.

Subproblem 1

x + -3.4 = 3.944616585 Simplifying x + -3.4 = 3.944616585 Reorder the terms: -3.4 + x = 3.944616585 Solving -3.4 + x = 3.944616585 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.4' to each side of the equation. -3.4 + 3.4 + x = 3.944616585 + 3.4 Combine like terms: -3.4 + 3.4 = 0.0 0.0 + x = 3.944616585 + 3.4 x = 3.944616585 + 3.4 Combine like terms: 3.944616585 + 3.4 = 7.344616585 x = 7.344616585 Simplifying x = 7.344616585

Subproblem 2

x + -3.4 = -3.944616585 Simplifying x + -3.4 = -3.944616585 Reorder the terms: -3.4 + x = -3.944616585 Solving -3.4 + x = -3.944616585 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.4' to each side of the equation. -3.4 + 3.4 + x = -3.944616585 + 3.4 Combine like terms: -3.4 + 3.4 = 0.0 0.0 + x = -3.944616585 + 3.4 x = -3.944616585 + 3.4 Combine like terms: -3.944616585 + 3.4 = -0.544616585 x = -0.544616585 Simplifying x = -0.544616585

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.344616585, -0.544616585}

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