Several properties are used to evaluate this expression. Identify the property used in each step. 21 + (36 + 0 + 19)
21 +(36 +19):
21 +(19 +36):
(21 +19) + 36:
40 + 36
76

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