Question

AX ELEVADO A 2 - 4 X - 16 = 0

Answer 1

x² - 4x - 16 = 0

∆=(-4)² -4.1.(-16)=16 +64=80 => √∆=4√5

x = 4 ± 4√5/2

x' = 4+4√5/2 = 2+2√5 ✓

x" = 4-4√5/2 = 2-2√5 ✓