What is the discriminant of x^2 - 7x - 7=0

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

Which of the following expressions is equal to 2x^2+8

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.