Question

Resolva as seguintes equações irracionais:


a) √3x = 6
b) 2√x = 4
c) √2x+5 = √x+8


(Me ajuda por favor)

Answer 1

a) $\sqrt{3x} =6\\ (\sqrt{3x} )^2=6^2\\3x=6\\x=2$

b) $2 \sqrt{x} =4\\(2 \sqrt{x} )^2=4^2\\4x=16\\x=4$

c)$(\sqrt{2x+5})^2= (\sqrt{x+8} )^2\\2x+5=x+8\\x=3$

Answer 2

a) (√3x)²=6²
3x=36
x=36/3
x=12

b) (2√x)²= 4²
4x=16
x=16/4
x=4

c) (√2x+5)² = (√x+8)²
2x+5=x+8
2x-2=8-5
x=3