Determine whether the given quadratic equation has root(s). If so, findthe root (s): z ²+ 2z – 8 = 0.

b = 2 and

c = –8
Δ = b ² – 4ac

= (2) ² – 4(1)(–8)

= 4 + 32

= 36
Therefore the quadratic equation has real roots.

= -4

= 2
Therefore, the roots are –4 and 2.