Question

x² + 9x +20 = ( )( )
x² + 8x +15 ( )( )


ajuuudem por favooor

Answer 1

x² + 9x + 20 = 0

a = 1, b = 9, c = 20

Δ = b² - 4ac

Δ = 9² - 4 × 1 × 20

Δ = 81 - 80

Δ = 1

x = - b ± $\sqrt{}$Δ / 2a

x = - 9 ± $\sqrt{1}$ / 2 × 1

x = -9 ± 1 / 2

x' = -9 + 1 / 2 = -4

x" = -9 -1 / 2 = -5

x² + 8x + 15 = 0

a = 1, b = 8, c = 15

Δ = b² - 4ac

Δ = 8² - 4 × 1 × 15

Δ = 64 - 60

Δ = 4

x = - b ± $\sqrt{}$Δ / 2a

x = - 8 ± $\sqrt{4}$ / 2 × 1

x = - 8 ± 2 / 2

x' = - 8 + 2 / 2 = -3

x" = - 8 - 2 / 2 = -5

Espero ter ajudado!!