=x^2+20x-19

Simple and best practice solution for =x^2+20x-19 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 =x^2+20x-19 equation:


Simplifying
0 = x2 + 20x + -19

Reorder the terms:
0 = -19 + 20x + x2

Solving
0 = -19 + 20x + x2

Solving for variable 'x'.

Combine like terms: 0 + 19 = 19
19 + -20x + -1x2 = -19 + 20x + x2 + 19 + -20x + -1x2

Reorder the terms:
19 + -20x + -1x2 = -19 + 19 + 20x + -20x + x2 + -1x2

Combine like terms: -19 + 19 = 0
19 + -20x + -1x2 = 0 + 20x + -20x + x2 + -1x2
19 + -20x + -1x2 = 20x + -20x + x2 + -1x2

Combine like terms: 20x + -20x = 0
19 + -20x + -1x2 = 0 + x2 + -1x2
19 + -20x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
19 + -20x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-19 + 20x + x2 = 0

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + 20x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + 20x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + 20x + x2 = 0 + 19
20x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
20x + x2 = 19

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 19 + 100

Reorder the terms:
100 + 20x + x2 = 19 + 100

Combine like terms: 19 + 100 = 119
100 + 20x + x2 = 119

Factor a perfect square on the left side:
(x + 10)(x + 10) = 119

Calculate the square root of the right side: 10.908712115

Break this problem into two subproblems by setting 
(x + 10) equal to 10.908712115 and -10.908712115.

Subproblem 1

x + 10 = 10.908712115 Simplifying x + 10 = 10.908712115 Reorder the terms: 10 + x = 10.908712115 Solving 10 + x = 10.908712115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 10.908712115 + -10 Combine like terms: 10 + -10 = 0 0 + x = 10.908712115 + -10 x = 10.908712115 + -10 Combine like terms: 10.908712115 + -10 = 0.908712115 x = 0.908712115 Simplifying x = 0.908712115

Subproblem 2

x + 10 = -10.908712115 Simplifying x + 10 = -10.908712115 Reorder the terms: 10 + x = -10.908712115 Solving 10 + x = -10.908712115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -10.908712115 + -10 Combine like terms: 10 + -10 = 0 0 + x = -10.908712115 + -10 x = -10.908712115 + -10 Combine like terms: -10.908712115 + -10 = -20.908712115 x = -20.908712115 Simplifying x = -20.908712115

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.908712115, -20.908712115}

See similar equations:

| 10p-18p+-14=18 | | -30=-2(3c-7) | | x+x-30=2x | | -9-6q=6-9q | | 2w+9ifw=15 | | 3v-12=4v | | 8(1r-12d)= | | -19+3g=5g+17 | | d/3−6=19 | | 5q+7=34 | | 10-14j=-12j | | 3g+-7=8 | | -1y^2-3=-y^2-y-3 | | -4(k-17)=0 | | 0.08x+0.11(3x+37000)=18290 | | 12d+6=9d | | -9-4K=-1-5k | | 1x/2x-1/10x=1/5-1/4 | | 4p=6p-16 | | -3(m-12)=-12 | | 81*.15= | | 12+c=-2c | | -4(x-3)=x | | -16k=-15k-16 | | -4n+5=13 | | -4+5=13 | | 8x/20x=9/20 | | 6x-6+x=4x+8 | | -9x+2.6+(-x)+(-12.8)= | | 2x+9-3x=12 | | z^2+16z+7=0 | | X+3y+3z=10 |

Equations solver categories