Question

Qual o resultado? 4ײ-16×+15=0

Answer 1

Olá, Biamelli!

4x² - 16x + 15 = 0
a = 4
b = -16
c = 15

Δ = b² - 4.a.c
Δ = (-16)² - 4.4.15
Δ = 256 - 240
Δ = 16

x = -b +- √Δ / 2.a
x = -(-16) +- √16 / 2.4
x = 16 +- 4 / 8

x' = 16+4/8 = 20:4/8:4 = 5/2
x'' = 16-4/8 = 12:4/8:4 = 3/2