Question

3) Encontre o valor de f(x) = x² + 3x – 10 para que f(x) = 0

Answer 1

Resposta:

f(x)=x²+3x-10

f(0)=0²+3.(0)-10

f(0)=0+3-10

f(0)= -7

Answer 2

x^2 + 3x - 10 = 0

Δ = b^2 - 4 . a . c

Δ = 3^2 - 4 . 1 . (- 10)

Δ = 9 + 40

Δ = 49

x = - b ± √Δ / 2 . a

x = - 3 ± √49 / 2 . 1

x = - 3 ± 7 / 2

x’ = - 3 + 7 / 2

x’ = 4 / 2

x’ = 2

x” = - 3 - 7 / 2

x” = - 10 / 2

x” = - 5

S = {2 ; - 5}