SOLUTION: I have a algebra problem that, I need help solving. Can you please help me.
sqrt (x+20) -x=0
Algebra.Com
Question 578376: I have a algebra problem that, I need help solving. Can you please help me.
sqrt (x+20) -x=0
Found 2 solutions by scott8148, stanbon:
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
adding x ___ sqrt(x+20) = x
squaring ___ x + 20 = x^2
subtracting (x + 20) ___ 0 = x^2 - x - 20
factoring ___ 0 = (x - 5)(x + 4)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
sqrt (x+20) -x=0
----
sqrt(x+20) = x
----
Square both sides:
x+20 = x^2
----
Rearrange:
x^2 -x - 20 = 0
---------
Factor:
(x-5)(x+4) = 0
----
x = 5 or x = -4
-----
Check:
Can x = 5 ?
sqrt(5+20)-5 = 0
5 - 5 = 0
------------------------
Can x = -4 ?
sqrt(-4+20)-(-4) = 0
sqrt(16) + 4 = 0
4 + 4 = 0
False
=======
Only solution : x = 5
========================
Cheers,
Stan H.
=======================
RELATED QUESTIONS
I have an algebra problem that I am having a hard time solving. It's been 30 years since (answered by solver91311)
Hi I need help solving this: {{{ x= sqrt(3)^8 }}}
It's the last step of my geometric... (answered by Tatiana_Stebko)
Hello. Can you please help me?
I need to solve this equation..
x^6-9x^4-x^2+9=0... (answered by nerdybill,rapaljer)
If you've got a minute, can you please help with this algebra problem?
4100 =... (answered by stanbon)
I need help solving this problem: You have climbed to the top of a tall tree. When you... (answered by Theo)
I need help solving this problem sqrt( x )... (answered by richwmiller)
Can you please help me with the below algebra problem.
f(x)= sqrt... (answered by edjones)
hi, i need help on solving the problem, {{{ sqrt(18)}}} x {{{sqrt (5/6)}}} . i don't... (answered by mananth)
I have one more problem that I need help in solving....I hope someone can help me. Thank... (answered by stanbon)