Thread: Radical numbers

x-5-2=3
radical sign is under the x-5.

x= x+7+5
radical sign is under the x+7

Multiply

(36 +2)(4-63)

simplify
(9x)^2
Is that 3x?

-125c^3

Find the domain of the given function.
F(x)=2x-3
radical sign is under the 2x-3.

Thank you

Originally Posted by rowdy3

x-5-2=3
radical sign is under the x-5.


Thank you

The first two are similar here is the first

add two to both sides

cube both sides

x= x+7+5
Would I subtract 5 from x? That would give me -5= x+7. I would square everything (-5)^2 = x=( x+7)^2. 25= x+7. I subtract 7 and get x=18.

Originally Posted by rowdy3

x= x+7+5
Would I subtract 5 from x? That would give me -5= x+7. I would square everything (-5)^2 = x=( x+7)^2. 25= x+7. I subtract 7 and get x=18.

it is a little hard to follow with your formatting but

Now square both sides

collectin like terms



So x=2 or x=9

we need to check both solutions to see if they work

plugging in 2 we get



so 2 is Not a solution

if you check 9 it does work so it is the only solution

2x+3 =9
(2x+3)^2 = (9)^2
2x+3=81
-3 -3
2x/2 = 78/2
x=39

simplify the following radicals

(9x)^2
My answer is 9x

-125c^3
Would that be -5c