SOLUTION: 3. -9(x-3)^2=-7
I got as far as x-3=rs 7/3 no radical sign.
Now I then do x=3/5 rs over the three and times it by 9/5. Do I multiply the 7 times the nine or or just leave i
Algebra.Com
Question 62388: 3. -9(x-3)^2=-7
I got as far as x-3=rs 7/3 no radical sign.
Now I then do x=3/5 rs over the three and times it by 9/5. Do I multiply the 7 times the nine or or just leave it as 9 plus or negative over 7/3.
Found 3 solutions by stanbon, funmath, checkley71:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
-9(x-3)^2=-7
(x-3)^2=7/9
Take the sqrt of both sides to get:
x-3=sqrt7/3
x=(sqrt7)/3 + 3
Cheers,
Stan H.
Answer by funmath(2933) (Show Source): You can put this solution on YOUR website!
You were almost done, you forgot that when you take the square root of both sides of an equation it's +/- the other side. All you would need, then is to add 3 to both sides.
3.
and <---this is fine
and is also fine.
Happy Calculating!!!
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
-9(x-3)^2=-7
-9(x^2-6x+9)=-7
-9x^2+54x-81=-7
-9x^2+54x-81+7=0
-9x^2+54x-74=0
9x^2-54x+74=0 using the quadratic equation x=(-b+-sqrt[b^2-4ac)]/2a we get
x=(54+-sqrt[-54*-54-4*9*74)]/2*9
x=(54+-sqrt[2916-2664])/18
x=(54+-sqrt-252)/18
x=(54+-15.87)/18
x=54+15.87)/18
x=69.87/18
x=3.88 solution
x=(54-15.87)/18
x=38.13/18
x=2.12 solution
-------------------------------------------------------------
ALL THESE ANSWERS ARE CORRECT. THEY ARE JUST IN DIFFERENT FORMS. IF YOU'LL SOLVE THE OTHER SOLUTIONS WITH THE RADICAL SIGNS YOU'LL SEE THEY GET THE SAME NUMBERS AS I GOT.
RELATED QUESTIONS
(rs) radical sign... (answered by gsmani_iyer)
(rs) radical sign... (answered by Cintchr)
How do i solve Radical Sign... (answered by richwmiller,MathTherapy)
1. If a man buys 1 lt of milk for Rs.12 and mixes it with 20% water and sells it for... (answered by edjones)
how do i reduce (x-9) divided by (radical x) -3 by factoring over the... (answered by Fombitz)
I took my test and got a lot of answers wrong. He circled the correct answers but no... (answered by rodriguezh2)
I have done this chapter over completely 5 times now and still I am not getting the why... (answered by richwmiller)
I am having some problems with some multiplying and dividing of polynomial fractions, and (answered by JenniferTutors)
i do not know what to do to solve this example.. (root sign)9x(x to the second power)... (answered by lotanez)