SOLUTION: Can someone please please help me with these questions. I am preparing for a quiz on Monday. 1) z sqrt 80zu^2 - u sqrt 5z^3 2) sqrt z +16 = sqrt 7z+12 3) sqrt -6w+16=w

Question 228591: Can someone please please help me with these questions. I am preparing for a quiz on Monday.
1) z sqrt 80zu^2 - u sqrt 5z^3
2) sqrt z +16 = sqrt 7z+12
3) sqrt -6w+16=w
4) sqrt 10+8 / -5 sqrt 10+1
Thank you in advance
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
1)
Factor to reveal the perfect squares

extract the squares and combine like terms
=
;
;
2)
Square both sides:
z + 16 = 7z + 12
16 - 12 = 7z - z
4 = 6z
z = =
;
;
3)
square both sides
-6w + 16 = w^2
0 = w^2 + 6w - 16
Factors to:
(w+8)(w-2) = 0
Two solutions
w = -8
w = +2;
Check both solutions in the original equation (only one is valid)
:
:
4) = = =
RELATED QUESTIONS
I am really stuck on these two problems. Can someone please explain to me how to do them? (answered by vleith)

I am a bit stuck on these few problems and I can't get any help....Someone please help... (answered by mananth)

Please can someone help? I have no idea where to start, and please show me how u got the... (answered by Alan3354)

I got these 2 wrong on a quiz & I don't know why. Can someone please help me? 9y2 +... (answered by Alan3354)

I am having trouble with square roots. Can you help me with these problems, please?... (answered by stanbon)

Can someone please help me with my questions please m practicing for exams thanks! (John... (answered by solver91311)

Please help me with these questions. I don't understand them that well. 2x= {{{ sqrt... (answered by macston)

please help me solve these problems. I am very confused and I need these problems... (answered by stanbon,josh_jordan)

Can someone help me with this i've tried and i am not ending up with the right solutions. (answered by tutorcecilia)