Whats the answer for this

4b²+20b+25

4b²+20b+25=0

Divide everything by 4

b²+5b + 6.25=0

use the quadratic formula

x = (-b + or - √b²-4ac) / 2a

x = (-5 + or - √5²-4*1*6.25) / 2 (1)

x = - 5/2 so

in this case, b = - 5/2