Question

Help and explain ? 3√x + 3 =15

Answer 1

3sqrt(x) + 3 = 15
3sqrt(x) = 12
sqrt(x) = 4
x = 16

Answer 2

The idea is to get your variables (x) alone on one side, while the constants (15, 3, numbers) are on the other side. Using this idea we moved the 3 over to the other side. Divided 3 from both sides, and to get rid of the sqrt sign we squared both sides.

Answer 3

Thankyou! but what if it's like this

Answer 4

√6-3x-2=0

Answer 5

the 6 and the 3x are both under the radical sign

Answer 6

so the sqrt function is the same as saying everything under the radical sign to the 1/2
in otherwards, (6-3x)^1/2.
To get rid of the 1/2 from under the radicand we can simply square both sides of the function. You see:
sqrt(6-3x) - 2 = 0
sqrt(6-3x) = 2
6-3x = 4 (Here we squared both sides since you have to apply the operation to both sides for it to remain true)
then we solve for x.
-3x = -2
x = 2/3

Answer 7

this helped alot, thanks for explaining!