Question

PRECISO DISSO PARA AMNHÃ POR FAVOR ME AJUDEM!!!!
Calcule as contas acima

Answer 1

1-x-81=0
X=81

2: 6x^2-12=0
6x^2=12
x^2=12:6
X=+/-√2

3: x^2+16=0
x^2=-16
x=+/-√-16.

4: x^2-81x=0
X(x-81)=0
X1=0 ou X2=81

5:16x^2-12x=0
usa ∆=b^2-4ac
usa x1,2=-b+/-√∆/2a