9x2+3x-7x-21=-9x2-4x-21=0

Simple and best practice solution for 9x2+3x-7x-21=-9x2-4x-21=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 9x2+3x-7x-21=-9x2-4x-21=0 equation: 



9x^2+3x-7x-21=-9x^2-4x-21=0

We move all terms to the left:

9x^2+3x-7x-21-(-9x^2-4x-21)=0

We add all the numbers together, and all the variables

9x^2-(-9x^2-4x-21)-4x-21=0

We get rid of parentheses

9x^2+9x^2+4x-4x+21-21=0

We add all the numbers together, and all the variables

18x^2=0

a = 18; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·18·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{0}{36}=0$

See similar equations:

| 1/3*x+x-90=0 | | 3/12x=-4/12x+3 | | -9x2-4x-21=0 | | 3/12x=-4/12+3 | | 3/4b-6=-4(1/4b-2) | | 8,523=8,000+x+20+3 | | 5a+3C=96 | | y/5+9=-12 | | -3x+5(3x-6)=-10-8x | | x^2+40x-2400=0 | | x/3-x+8=0 | | 5/3x-6=8+5/12x | | x^2-110x+2925=0 | | -5=x=-2 | | (5−x)1/2−2x=0(5−x)1/2−2x=0. | | 9x-81+4=9x+7 | | -14x^2+1680x-49,000=0 | | 9x^2+3x-7x-21=0 | | 3=-7b+6b | | 3/(y-4)= | | 0.2(x-4)=2 | | 3(2x-1)-2(2x-3)=5x | | 2/3(x+1)+x=1/6 | | (2x+5)/8-1=3 | | 2e+20=7e+8 | | 1/x=42.8 | | 3-5(4x+6)=-9 | | x/(9.9+x)=0.1 | | 9=x/7.68+3 | | -7=-2n+3n | | 12+3x=5x-6 | | 8(×-7)=5x+3x+3 |

Equations solver categories