Can someone help and show how this is solved

An assembly consists of two mechanical components. suppose that the probabilities that the first and second components meet specifications are 0.87 and 0.84. assume that the components are independent. determine the probability mass function of the number of components in the assembly that meet specifications. x

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

Me. i can't figure out this question. give an explanation too. .