Question

responda 3x2-2x-15=0

Answer 1

3x² - 2x - 15 = 0

Δ = b² - 4.a.c 
Δ = -2² - 4 . 3 . -15 
Δ = 4 - 4. 3 . -15 
Δ = 184

Há 2 raízes reais.

x = (-b +- √Δ)/2a

x' = (--2 + √184)/2.3   
x'' = (--2 - √184)/2.3

x' = 15,564659966250536 / 6   
x'' = -11,564659966250536 / 6

x' = 2,5941099943750894   
x'' = -1,9274433277084226