Question

X² - 7x - 18 = 0
preciso do delta ​

Answer 1

Resposta:

Explicação passo a passo:

a=1

b=-7

c=-18

x=7+-V(-7)²-4.1.-18/2.1

x=7+-V49+72/2

x=7+-V121/2

x=7+-11/2

x'=7+11/2=18/2=9

x''=7-11/2=-4/2=-2

S={-2,9}