5x²+bx+24=0 [tex] x_{1}=8 b-?

Question

5x²+bx+24=0
[tex] x_{1}=8
b-?

Answer 1

X1+x2= -b/5
x1*x2=4,8

8+x2= -b/5
8x2=4,8

-b=40+5x2
x2=0,6

b= -40-5x2
x2=0,6

b= -40-5*0,6
b= -40-3
b= -43