Question

Resolva na fórmula de bháskara: (x+4) . (x-1)=5x+20

Answer 1

(x+4) × (x-1) = 5x + 20 
x² - x + 4x - 4 = 5x + 20 
x² + 3x - 4 = 5x + 20
x²- 2x - 24 = 0

Δ= b² - 4ac 
Δ= (-2)² - 4×1×(-24)
Δ=4 + 96
Δ= 100

x= -b +-√Δ / 2a
x= - (-2) +- √100 / 2×1
x= 2 +- 10 / 2
x'= 2+10/2= 6
x"= 2-10/2 = -4