2r^2-9r+7=0

Simple and best practice solution for 2r^2-9r+7=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 2r^2-9r+7=0 equation: 



2r^2-9r+7=0

a = 2; b = -9; c = +7;
Δ = b2-4ac
Δ = -92-4·2·7
Δ = 25
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{25}=5$


$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9)-5}{2*2}=\frac{4}{4}
=1
$


$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+5}{2*2}=\frac{14}{4}
=3+1/2
$

See similar equations:

| 5x-1=21+3 | | 4(b-17)=4b+12-17 | | 6=2v=8 | | 13=g/3+9 | | 3t^2-t+3=0 | | j/4=13=17 | | X=(3y+2) | | 4x45=(8x35)+8+10 | | (8x)+(x-18)=180 | | 3x-6x=20-3x+4x | | 6u^2-8u+7=0 | | 4.5(x+9)=63 | | 2-5x=107 | | 7s^2-s+8=0 | | 1/4x=1/2x-9x4 | | -3-v-3v=1 | | 6x+2x3=12x+9 | | 27x5=(x5)+17+5 | | 8q^2+3q+1=0 | | -19=1-3x-2 | | 5(y+25)=-13 | | -5(3x-15)=2(x-11)-5 | | 6u^2+8u+1=0 | | (x-3)(x+4)=x^​2+4 | | k−7=-6k | | 8.88=4.44(x−7) | | 4/4x=4/2x-9*4 | | 8Xn=176 | | 3.5d+9.75=4+4.25d | | -1/8x+-1/2=1/4 | | x+.05x=175000 | | 8y^2-7y-6=0 |

Equations solver categories