What are the values of a, b, and c in this equation?
x^2+4x-21=0
a = 1, b = 4, c = - 21
a = 1, b = 4, c = 21
a = 0, b = 4, c = - 21
a = 0, b = 4, c = 21
x^2+4x-21=0
a = 1, b = 4, c = - 21
a = 1, b = 4, c = 21
a = 0, b = 4, c = - 21
a = 0, b = 4, c = 21
