Question

Resolva as equaçaõ expenenciais
10x2-2x-2=10

Answer 1

10x2-2x-2=10
20x-2x = 10 +2
18x = 12
x = 12÷18
X = 0,66

Answer 2

veja...

exponencial

$\not10^{ x^{2} -2x-2}=\not10^1 \\ \\ x^{2} -2x-2=1 \\ x^{2} -2x-2-1=0 \\ x^{2} -2x-3=0$ 

a=1
b=-2
c=-3

Δ=b²-4ac
Δ=(-2)²-4(1)(-3)
Δ=4+12
Δ=16

x=(-b±√Δ)/2a=  [-(-2)±√16]/2= (2±4)/2

x'=(2+4)/2=6/2=3
x"=(2-4)/2=-2/2=-1

S={-1,3}