Question

Bài 1:Giải phương trình
a)\(9-\sqrt{x+4}=\dfrac{13}{2}\)
b)\(\sqrt{4-12x}+\dfrac{2}{3}\sqrt{9-27x}=3\)
c)\(\sqrt{x^2-10x+25}+1=\dfrac{1}{2}\)
d)\(\sqrt{4x^2+4x+1}-3=x\)

Answer 1

`a, sqrt(x+4) = 5/2`

`x + 4= 25/4`

`x = 9/4`.

`b, 2 sqrt(1-3x) + 2 sqrt(1-3x) = 3`

`sqrt(1-3x) = 3/4`

`1 - 3x = 9/16`

`3x = 7/16`

`x = 7/48`

 

Answer 2

`c, x - 5 +1= 1/2`

`x - 4 = 1/2`

`x =9/2`.

`d, 2x + 1 - 3 = x`

`x - 2 =0`

`x = 2`