21x^2-x-2=0

Simple and best practice solution for 21x^2-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 21x^2-x-2=0 equation:


Simplifying
21x2 + -1x + -2 = 0

Reorder the terms:
-2 + -1x + 21x2 = 0

Solving
-2 + -1x + 21x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-2 + -7x)(1 + -3x) = 0

Subproblem 1

Set the factor '(-2 + -7x)' equal to zero and attempt to solve: Simplifying -2 + -7x = 0 Solving -2 + -7x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -7x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -7x = 0 + 2 -7x = 0 + 2 Combine like terms: 0 + 2 = 2 -7x = 2 Divide each side by '-7'. x = -0.2857142857 Simplifying x = -0.2857142857

Subproblem 2

Set the factor '(1 + -3x)' equal to zero and attempt to solve: Simplifying 1 + -3x = 0 Solving 1 + -3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -3x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -3x = 0 + -1 -3x = 0 + -1 Combine like terms: 0 + -1 = -1 -3x = -1 Divide each side by '-3'. x = 0.3333333333 Simplifying x = 0.3333333333

Solution

x = {-0.2857142857, 0.3333333333}

See similar equations:

| 2w=60-2w/2 | | 25=p^2 | | 7(t-8)=2(t+1)+2 | | -x(-2x+3x-2)= | | 4(x+4)=18 | | ab+cd=0 | | -15x+-9=21 | | 37/9 | | 8(s+3)=62 | | 2log(3x+1)=2 | | y-2=-.2(x-4) | | 21x^2=x+2 | | (2x-3)(x+9)=(x-3)(x+9) | | cos(x)*cosh(x)-1=0 | | y+3=-.2(x-1) | | 5(-3+x)=-15 | | -5(x-2)= | | y-3=-.2(x+1) | | 3y+10=5y+13 | | COS60=6/x | | -40uv-40v+35= | | 2x-55=3x+10 | | .40x+.33x= | | 4x+-7=-23 | | 1/4(6n-3)=4n=1 | | fx= | | log(2)64=x | | -3x+-25=8 | | (-10/9)/(5/6) | | y-3=.2(x+1) | | x=28/0.07 | | 2y+1y=12 |

Equations solver categories