Delete
Share
This Question is Closed
ParthKohli
Best Response
You've already chosen the best response.
0
A good start is subtracting 64 from both sides.\[ \color{Black}{\Rightarrow 9x^2 + 3x + 25 - 64 = 0}\] Simplify, and solve the quadratic equation.
a.galvan2
Best Response
You've already chosen the best response.
0
the 9x^2 is what I am confused about.
Ganpat
Best Response
You've already chosen the best response.
2
confused ??
Ganpat
Best Response
You've already chosen the best response.
2
u can solve it by factorization...
BougyMan
Best Response
You've already chosen the best response.
0
(9x^2+3x)(25-64)
Ganpat
Best Response
You've already chosen the best response.
2
9x2+30x+25=64
9x2+30x+25-64 = 0
9x2+30x-39 = 0
9x2 -9x + 39x -39 = 0
9x(x-1) +39 (x-1) = 0
(9x +39) (x-1) = 0
so, x = -39/9 and x =1....
a.galvan2
Best Response
You've already chosen the best response.
0
sorry, but I do know the answer involves imaginary numbers.
agentx5
Best Response
You've already chosen the best response.
1
Actually no...
The solutions for x as an answer does not involve imaginary #'s, and it's not 59/3
agentx5
Best Response
You've already chosen the best response.
1
@Ganpat is correct.
cornitodisc
Best Response
You've already chosen the best response.
0
ah..so my answer was wrong...sorry
agentx5
Best Response
You've already chosen the best response.
1
With the imaginary line, it's the intersection:
|dw:1343664593480:dw|
a.galvan2
Best Response
You've already chosen the best response.
0
The answer in the back of the book is \[x=(-10+2i \sqrt14)/6, (-10-2i \sqrt14)/6 \]
I just can't figure out how it got there.
agentx5
Best Response
You've already chosen the best response.
1
The blue line is (3x+5)^2
The imaginary line is 64i
agentx5
Best Response
You've already chosen the best response.
1
That answer is crazy, this has solvable real number values. Yes you can combine those to get X, but why?
agentx5
Best Response
You've already chosen the best response.
1
In this case I'd say either the problem was written down for us incorrectly/incomplete-directions, or the book is making it a whole lot harder than it needs be...
a.galvan2
Best Response
You've already chosen the best response.
0
i do not know.
agentx5
Best Response
You've already chosen the best response.
1
:-S
Go with what @Ganpat said, unless there's something missing or incorrect here with regards to the question and it's directions as you wrote it here. He's 100% correct.
agentx5
Best Response
You've already chosen the best response.
1
Plug in those values for x and you'll it works.
Ganpat
Best Response
You've already chosen the best response.
2
@agentx5 : when did i say that ? :D.. lol
agentx5
Best Response
You've already chosen the best response.
1
Huh? o_O
Ganpat
Best Response
You've already chosen the best response.
2
kidding dude !! :)