What is the answer of 4(b+3) when b is 6?

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

What is always true when two whole numbers are subtracted?