Question

urgente mim ajudem x2-81x=0 equacao do 2° grau

Answer 1

Calcule delta primeiro :
delta = b²-4ac   delta = (-81)²-(4.1.0)    delta = 6561

Calculando o X :
x = (-b+-raiz quadrada de delta)/2a 
x = (81+-81)/2
x = 81 e 0

Answer 2

x²+81x=0 a=1 b=81 c=0 Δ=b²-4.a.c Δ=81²-4.1.0 Δ=6561-0 Δ=6561 x=-b+-√Δ/2.a x'=-81+81/2.1 x'=0/2 x'=0 x''=-81-81/2.1 x''=-162/2 x''=81