Question

Me ajudem 8x2-14x+3 <=0

Answer 1

8x² - 14x + 3 ≤ 0
a = 8
b = - 14
c = 3
Δ = b² - 4.a.c
Δ = (-14)² - 4 . 8 . 3
Δ = 196 - 96
Δ = 100
x = - b + - √Δ/2a
x = - (-14) + - √100/2 . 8
x = 14 + - 10/16
x' = 24/16 ⇒ x' = 3/2 ⇒x' = 1,5
x" = 4/16 ⇒ x" = 1/4 ⇒ x" = 0,25

S = { x ∈ R / 1,5 ≥ x ≤ 0,25 }