Question

5x²-20=0
calcule a raiz dessa equaçao pra mim pfvr !!

Answer 1

5x² -20 =0
a= 5  b=0  c= -20
Δ=b² -4.a.c
Δ= (0)² -4.5.(-20)
Δ= 0 + 400
Δ= 400

x= -b +- √Δ
         2.a
x= - 0 +- √400
         2.5
x= +- 20
       10
x'= 20 = 2
     10
x"= -20 = - 2
       10

S= { -2 ; 2 }