Question

Y²-5y-14=0 me ajudem

Answer 1

y²-5y-14=0

Δ=(-5)²-4.1.(-14)
Δ=25+56
Δ=81

y=(-(-5)+-√81)/2.1
y=(5+-9)/2

y'=5+9/2=7
y''=5-9/2=-2

Answer 2

y² - 5y - 14 = 0
a = 1, b = - 5, c = - 14

Δ = b² - 4ac
Δ = (- 5)² - 4 . 1 . (- 14)
Δ = 25 + 56
Δ = 81

x = (- b ± √Δ)/2a
x = (- (- 5) ± √81)/2 . 1
x = (5 ± 9)/2

x' = (5 + 9)/2 = 14/2 = 7
x'' = (5 - 9)/2 = - 4/2 = - 2

S = {7, - 2}