2x^2-x-19=0

Simple and best practice solution for 2x^2-x-19=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 2x^2-x-19=0 equation:


Simplifying
2x2 + -1x + -19 = 0

Reorder the terms:
-19 + -1x + 2x2 = 0

Solving
-19 + -1x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-9.5 + -0.5x + x2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + -0.5x + 9.5 + x2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + -0.5x + x2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + -0.5x + x2 = 0 + 9.5
-0.5x + x2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
-0.5x + x2 = 9.5

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 9.5 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 9.5 + 0.0625

Combine like terms: 9.5 + 0.0625 = 9.5625
0.0625 + -0.5x + x2 = 9.5625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(x + -0.25) equal to 3.092329219 and -3.092329219.

Subproblem 1

x + -0.25 = 3.092329219 Simplifying x + -0.25 = 3.092329219 Reorder the terms: -0.25 + x = 3.092329219 Solving -0.25 + x = 3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 3.092329219 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 3.092329219 + 0.25 x = 3.092329219 + 0.25 Combine like terms: 3.092329219 + 0.25 = 3.342329219 x = 3.342329219 Simplifying x = 3.342329219

Subproblem 2

x + -0.25 = -3.092329219 Simplifying x + -0.25 = -3.092329219 Reorder the terms: -0.25 + x = -3.092329219 Solving -0.25 + x = -3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -3.092329219 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -3.092329219 + 0.25 x = -3.092329219 + 0.25 Combine like terms: -3.092329219 + 0.25 = -2.842329219 x = -2.842329219 Simplifying x = -2.842329219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.342329219, -2.842329219}

See similar equations:

| -3/4/1 | | 1/4y-4=5y+2-8y | | 7s-8=-7+8s | | 3y-29=-17+6y | | 0.25x+0.05(10-x)=0.10(-7) | | 2y-3=5y+3 | | 8s+7r= | | 5t+10=45 | | 2x=4(x-4)-8 | | 7x=9x | | -36x^2-24x+3=0 | | 10q-25=25 | | 147a^6b^6/-21a^9b^-8 | | 0.96x-1.8x=-12.6 | | 20=(3x+1) | | (7/8t)+(3/4t)=26 | | 5y+3x=2 | | 2(w-2)=10 | | 2/(7x)+1/4=53/(14x)-1/3 | | m^2-2m-143=0 | | x+y=42 | | b-1-3b-4=b | | 16j-8= | | 2/7x+1/4=53/14x-1/3 | | (24p^-5)/(6p^2) | | 2x=20+5(x+2) | | 3/20x=6 | | 5t-9=3t-1 | | (9-2x)(9-2x)=0 | | 4x+5(a)x=-2 | | 2-2x/7=x/2+17/2 | | -x=-84/55 |

Equations solver categories