Question

os zeros da função f(x) = 5x2-7x+2

Answer 1

f(x) = 5x²-7x+2
5x²-7x+2=0

Δ= (-7)² - 4 . 5 . 2
Δ= 49 - 40
Δ= 9

X= - (-7) ± √9 / 2.5
X= 7 ± 3 / 10
X'= 7 + 3 / 10 = 10 / 10 = 1
X"= 7 - 3 / 10 = 4 / 10 = 2 / 5

R={ 1 , 2/5 }