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
it is a little hard to follow with your formatting but
$\displaystyle x=\sqrt{x+7}+5 \iff x-5=\sqrt{x+7}$ Now square both sides
$\displaystyle (x-5)^2=(\sqrt{x+7})^2 \iff x^2-10x+25=x+7$ collectin like terms
$\displaystyle x^2-11x+18=0 \iff (x-2)(x-9)=0$
So x=2 or x=9
we need to check both solutions to see if they work
plugging in 2 we get
$\displaystyle 2 \overbrace{=}^{?} \sqrt{2+7}+5 \iff 2 \ne 3+5$
so 2 is Not a solution
if you check 9 it does work so it is the only solution