Use the quadratic formula to solve the equation. if necessary, round the nearest hundredth. 2a^2-30a+108=0

We know that

the formula to solve the quadratic equation is
x={-b(+/-)√[b²-4ac]}/2a

we have 
2a²-30a+108=0
where
a=2
b=-30
c=108

x={30(+/-)√[30²-4*2*108]}/(2*2)
x={30(+/-)√[36]}/(4)
x={30(+/-)6}/(4)
x1=(30+6)/4> 36/4> 9
x2=(30-6)/4> 24/4>  6

the answer is
the values of a are
a1=9
a2=6