21x^2-15x-6=0

Simple and best practice solution for 21x^2-15x-6=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^2-15x-6=0 equation:


Simplifying
21x2 + -15x + -6 = 0

Reorder the terms:
-6 + -15x + 21x2 = 0

Solving
-6 + -15x + 21x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-2 + -5x + 7x2) = 0

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

Ignore the factor 3.

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 + -1x)' equal to zero and attempt to solve: Simplifying 1 + -1x = 0 Solving 1 + -1x = 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 + -1x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1x = 0 + -1 -1x = 0 + -1 Combine like terms: 0 + -1 = -1 -1x = -1 Divide each side by '-1'. x = 1 Simplifying x = 1

Solution

x = {-0.2857142857, 1}

See similar equations:

| x*4=5.3 | | 3(g-19)=9 | | 9+r=-7 | | -z+z+14=0 | | (-16a^5b^3/8a^6b^-6)^3 | | -39+8x=-8(x+7)-x | | 3x+25+2x=90 | | b+5=-12 | | 1,400=r/7 | | h+2=-6 | | 86+5r=46 | | 7d-3+2d=5d-8d+1 | | 5+p=-7 | | 20m^2-212m+120= | | x=83/8 | | 7.5+.5x=7.5 | | 4x-6=71/2 | | 5=j/14 | | s+(-3)=-10 | | x-10=1+5 | | 10m^2-34m-24= | | 3x^3(2x-8)=0 | | 2x+14y=18 | | 30x^2+198x+240= | | 23=d-12 | | 25xy+30x-15y-18=0 | | 15+v=-2 | | 3x^2+35x+72= | | 9x-4x=55 | | 2y+18=-54 | | 5v^4-20v^3-45= | | 1/4(10x-9)=8 |

Equations solver categories