Question

Calcule o resultado das raizes usando a formula de Bhaskara : x²-2x-8=0 

Answer 1

Δ= b²-4.a.c
Δ= (-2)²-4.1.(-8) 
Δ= 4-4.1(-8) 
Δ= 4+32
Δ=36 
 X' = -b +/-√Δ/2 
x' = -(-2)+6/2 = 2+6/2 = 8/2= 4 
x"= -(-2)-6/2 = 2-6/2 = -4/2= -2 
S {-2; 4}