Question

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

Answer 1

a = 1, b = 4, c = - 21

Answer 2

Exactly what you said...
a = 1, b = 4, c = - 21
a = 1, b = 4, c = 21
a = 0, b = 4, c = - 21
a = 0, b = 4, c = 21