Question

X²-49=0 bhaskara
Como resolver? com conta armada.

Answer 1

x² - 49 = 0
Δ = 0² - 4.1.-49
Δ = 0 + 196
Δ = 196

x = 0 +-√196/2
x = 0 +-14/2
x' = 14/2 = 7
x'' = -14/2 = -7           S = { -7 , 7 }       ok

Answer 2

x² - 49 = 0
x² = 49
x = ±$\sqrt{49}$
x = ±7