(7i-2)(3i+1)=0

Simple and best practice solution for (7i-2)(3i+1)=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 (7i-2)(3i+1)=0 equation:



(7i-2)(3i+1)=0
We multiply parentheses ..
(+21i^2+7i-6i-2)=0
We get rid of parentheses
21i^2+7i-6i-2=0
We add all the numbers together, and all the variables
21i^2+i-2=0
a = 21; b = 1; c = -2;
Δ = b2-4ac
Δ = 12-4·21·(-2)
Δ = 169
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$i_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$i_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{169}=13$
$i_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-13}{2*21}=\frac{-14}{42} =-1/3 $
$i_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+13}{2*21}=\frac{12}{42} =2/7 $

See similar equations:

| 3r+4=97 | | 3y+4=130 | | m(3-m)=-9m | | -83+14x=77+4x | | 90+(3x+43)+(4x+12)=180 | | k2+12k+23=0 | | (4x+5)+(6x+3)+(5x+7)=180 | | 2(x-2)+5(x-5=6 | | 13y+3y=256 | | Y=7.5x+54 | | -119+8x=79+2x | | 2(x-4)/5=4 | | (4x-5)+(3x-7)+(x)=180 | | -8d=-10−10d | | (4x-8)(5x+2)=0 | | (3^2x)(4^x)=6 | | Y=2.4x+75.6 | | (32x)(4x)=6 | | Y=7.5x=54 | | 3+4/5=7-2x | | 6n-26=4n | | y-3=5(1.4-2) | | 34=v/4+11 | | Y=0x+54 | | x/3.5=1/7 | | -5=-2+w | | X.x/8+5=14 | | 24x+16=0 | | 20n−16n=20 | | 1/4(3x+1)+3=7 | | Y=6950+2.5x | | 3.6(x+4.5)=41.4 |

Equations solver categories