Question

resolva usando a formula do delta : A =b²-4.a.c x²+8×+15=0 a)4 b) 8 c) 12 d ) 16


urgente ​

Answer 1

Sendo f(x) = x² + 8x + 15.

x² + 8x + 15 = 0

logo: A = 1; B = 8; C = 15.

Aendo assim, calculando o delta:

∆ = B² - 4AC

∆ = 8² - (4 . 1 . 15)

∆ = 64 - 60

∆ = 4

alternativa a) ∆ = 4