Question

O valor de x na equação Vx-2 + Vx-3-1=0 a) 12
b) 4
c) 0
d) 6
e) 3

Answer 1

Vamos chamar Vx de y

y-2+y-3-1=0
2y-6=0
2y=6
y=6/2
y=Vx=3

Alternativa E

Answer 2

vamos lá...

$\sqrt{x-2} + \sqrt{x-3} -1=0 \\ \\ ( \sqrt{x-2} )^2=(1+ \sqrt{x-3} )^2 \\ \\ x-2=1+2 \sqrt{x-3} +x-3 \\ \\\not x-2-1-\not x+3=2 \sqrt{x-3} \\ \\ -\not3+\not3=2 \sqrt{x-3} \\ \\ (2 \sqrt{x-3} )^2=0 \\ \\ 4(x-3)=0 \\ \\ 4x-12=0 \\ \\ 4x=12 \\ \\ x=12\div4 \\ \\ x=3$

R: Letra E