Question

resolva as equações do 2 grau X2-18x+45=0 me, ajude ai

Answer 1

x² - 18x + 45 = 0

delta = b² - 4.a.c

a= 1
b= -18
c= 45


delta = (-18)² - 4.1.45
delta = 324 - 180
delta = 144

x = -b ± √delta/2.a

x = -(-18) ± √144/2.1

x = 18 ± 12/2

x = 18 - 12/2 = 6/2 = 3

x = 18 + 12/2 = 30/2 = 15

s={ 3, 15 }