Question

responda: y=x²+2x-3 (-3,-2,-1,0,1) ?

Answer 1

x² + 2x - 3 = 0   a) 1 b) 2 c) -3
Δ= b² - 4 . a . c
Δ = 2² - 4 . 1. -3
Δ = 4 + 12
Δ = 16

-b +/- √Δ / 2. a
 - 2 +/- √16 / 2 . 1
-2 +/- 4 / 2
x' = -2 + 4/2 = 2/2 = 1
x'' = -2 - 4 /2 = - 6/2 = - 3
S = { 1 , - 3 }