20-10x-x^2=0

Simple and best practice solution for 20-10x-x^2=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 20-10x-x^2=0 equation:


Simplifying
20 + -10x + -1x2 = 0

Solving
20 + -10x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
-20 + 10x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 10x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + 10x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 10x + x2 = 0 + 20
10x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
10x + x2 = 20

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 20 + 25

Reorder the terms:
25 + 10x + x2 = 20 + 25

Combine like terms: 20 + 25 = 45
25 + 10x + x2 = 45

Factor a perfect square on the left side:
(x + 5)(x + 5) = 45

Calculate the square root of the right side: 6.708203933

Break this problem into two subproblems by setting 
(x + 5) equal to 6.708203933 and -6.708203933.

Subproblem 1

x + 5 = 6.708203933 Simplifying x + 5 = 6.708203933 Reorder the terms: 5 + x = 6.708203933 Solving 5 + x = 6.708203933 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 6.708203933 + -5 Combine like terms: 5 + -5 = 0 0 + x = 6.708203933 + -5 x = 6.708203933 + -5 Combine like terms: 6.708203933 + -5 = 1.708203933 x = 1.708203933 Simplifying x = 1.708203933

Subproblem 2

x + 5 = -6.708203933 Simplifying x + 5 = -6.708203933 Reorder the terms: 5 + x = -6.708203933 Solving 5 + x = -6.708203933 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -6.708203933 + -5 Combine like terms: 5 + -5 = 0 0 + x = -6.708203933 + -5 x = -6.708203933 + -5 Combine like terms: -6.708203933 + -5 = -11.708203933 x = -11.708203933 Simplifying x = -11.708203933

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.708203933, -11.708203933}

See similar equations:

| 6/25=d-30 | | 8-.8=f-14-2f | | 10=1/4x | | Y/67=-81-(-1262) | | (Y-4)(y^2-5y-2)= | | 10-8x=2(5+4x) | | 36-3r=18-6r | | f(2)=1.25x | | F=-3+2.5x+-1x^2 | | 11w=6w+25 | | -(y-10.9)=1.4y-1.1 | | 5(-X-7)+3=-13 | | -7n(5n-8)=0 | | 9w=24+w | | 10y+6=76 | | 2x-2.5=0.5x-2.5 | | 7x+2x=100 | | 1=n/10+3 | | -x/6-7/5 | | 3(9b-6)-6=6b-3 | | (2x+6)+(2x+1)=4(x+1)+8 | | 11v=10+9v | | -124=-4(1+5x) | | 1/3b^2*4=48 | | (2x-8)+(3x-10)= | | j/6=--1/3 | | 6m+7=13 | | 4x+6y=12y | | -9-9n=-63 | | 118=4x+5x+10 | | -12+5y+7q-2y-5q-21= | | 8+5x=-6+30 |

Equations solver categories