X^2-21+4y=0

Simple and best practice solution for X^2-21+4y=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 X^2-21+4y=0 equation: 



X^2-21+4X=0

a = 1; b = 4; c = -21;
Δ = b2-4ac
Δ = 42-4·1·(-21)
Δ = 100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{100}=10$


$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-10}{2*1}=\frac{-14}{2}
=-7
$


$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+10}{2*1}=\frac{6}{2}
=3
$

See similar equations:

| 3p+7=5p–19 | | t2-7t=-10 | | a2-9=16 | | 15=2/3x | | 9x2+x=0 | | X3-3x+6=0 | | 0=x^2-12x-55 | | 6x-7/3x+2=5/8 | | (3x^2+4x)/x-1=0 | | Z=10y+110 | | x2+4x+1.5=222 | | 8.8t^2-15.5t-60=0 | | -4n-19=-5n | | 5t^2+14t-6=0 | | -7+12j=-17+8j-14 | | 3d+3=4d+20 | | -1-3b=-8-9b+5b | | 5(2x+1)=135 | | 5(2x+1)=131 | | 5(2x+1)=165 | | 5y+3(2+y)=54 | | 7(x-9)=8x-3 | | 7(x-5)=8x-3 | | 2x(2+2)-4=20 | | 4x/6=7-3x | | -q^2-70q+12000=0 | | 11×5.2=z | | 6.4=y/4y= | | X+6x=644 | | 6(x+3)+1=21 | | 6x-x=644 | | -2x^2-12x+9=0 |

Equations solver categories