Question

X AO QUADRADO - 2X-15=0

Answer 1

x² -2x -15= 0

∆=4 +60=64 => √∆=8

x'= -b+√∆/2a = 2+8/2=10/2= 5 ✓

x"= -b-√∆/2a = 2-8/2= -6/2= -3 ✓

Answer 2

x² - 2x - 15 = 0

A= 1

B= - 2

C= - 15

∆= b² - 4ac

∆= ( - 2)² - 4 • 1 • ( - 15)

∆= 4 + 60

∆= 64

x= - b ± √∆/2a

x= - ( - 2) ± √64/2 • 1

x= 2 ± 8/2

x'= 2 + 8/2 = 10/2 = 5

x''= 2 - 8/2 = - 6/2 = - 3

S= ( - 3 , 5)

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