Verified answer

Check your question !

9 = √3x-12+4 = x ! what's it ?

assuming equation is

9 = √(3x-12) + 4

9 - 4 = √(3x-12)

5 = √(3x-12)

(5)^2 = (√(3x-12))^2

25 = (3x - 12)

25 = 3x - 12

25 + 12 = 3x

37 = 3x

3x/3 = 37/3

x = 37/3

double checked the math, your answer is wrong.

CHECK that answer is in fact 20:

9 = √[3(20) - 12] + 4

5 = √(60 - 12)

5 = √48

5 = 4√3

which is NOT the case, so your answer is wrong!

CHECK: x = 37/3:

9 = √[3(37/3) - 12] + 4

5 = √(37 - 12)

5 = √25

5 = 5

which it does

First. Please, write it correctly. I don't want to assume, & don't know what that's mean 2 equals.