5x squared + 30x=0
How does that equal zero?

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Ineed with number 6 , explain how to get 1978

Can someone explain to me how to do