Question

X² - 7x - 60 forma faturada

Answer 1

x² - 7x - 60 
a = 1  b = -7  c = -60

Δ = b² - 4ac
Δ = (-7)² - 4.1.(-60)
Δ = 49 + 240
Δ = 289

x = $\frac{ -b +/- √Δ}{2a}$
x = $\frac{-(-7) +/- √289}{2.1}$
x = $\frac{7 +/- 17}{2}$

x ¹ = $\frac{7+17}{2}$ = $\frac{24}{2}$ = 12
x ² = $\frac{7-17}{2}$ = $\frac{-10}{2}$ = -5