Question

funçao quadratica !
n(x)= x²+5x-8

Answer 1

Δ= b²-4.a.c
Δ 5²-4.1.(-8)
Δ= 25+32
Δ=57
Δ=√57

x= -b+√Δ / 2a
 x' = -5+ 7,54 /2
x'= 2,54/2 
x' = 1,27
 
x'' = -b-√Δ/2a
x'' = -5-2,54/2
x'' =3,77

Answer 2

n(x) = x² + 5x - 8
0 = x² + 5x - 8
x² + 5x - 8 = 0
a = 1; b = 5; c = - 8

Δ = b² - 4ac
Δ = 5² - 4.1.(-8)
Δ = 25 + 32
Δ = 57

x = - b +/- √Δ = - 5 +/- √57
          2a               2.1

x' = - 5 + √57
            2

x" = - 5 - √57
            2