Question

Resolva as equações irracionais:  √2x+7 =4

Answer 1

$\sqrt{2x+7}=4 \\ (\sqrt{2x+7})^2=4^2 \\ 2x+7=16 \\ 2x=16-7 \\ 2x=9 \\ \boxed{x=\frac{9}{2}}$

Answer 2

  (√2x )^2 = ( 4 - 7)^2

    2x  = (-3)^2
     2x = 9
 
      x= 9/2