Ask
your own question, for FREE!
Mathematics
18 Online
Factor the polynomial completely.
Still Need Help?
Join the QuestionCove community and study together with friends!
\[7x ^{3}-4x ^{2}+8x\]
how did you get that? and aren't you supposed to find the 2 numbers after factoring (using the table or box method)
ok
\[7x^3-4x^2+8x=x(7x^2-4x+8)\] 7x^2-4x+8 has no real roots so, to continue factorising, we must use complex numbers. We solve 7x^2-4x+8 using the quadratic formula to get x = 2/7 +- root(52)/7 i Thus \[7x^3-4x^2+8x=x(x- \frac27 - \frac{\sqrt{52}}7 i)(x- \frac27 + \frac{\sqrt{52}}7 i)\]
Which is quite ugly. Stick to the real numbers. It is neater
Still Need Help?
Join the QuestionCove community and study together with friends!
so what would be the final answer?
Have you worked with complex factorising before?
If not, use the first line of my answer
ok. and no i'm in algebra 2. thanks!
Sure
Can't find your answer?
Make a FREE account and ask your own questions, OR help others and earn volunteer hours!
Join our real-time social learning platform and learn together with your friends!
Join our real-time social learning platform and learn together with your friends!
Latest Questions
SnowyBreaks:
You ever get the types of dreams where it feels as if you aren't breathing? And w
laylasnii13:
Poem/diary i wrote I Want Out Iu2019m so tired of screaming into walls. Every fight with my mom leaves something broken and itu2019s not just plates or slam
Countless7Echos:
Aye.. I need actually some help on the shading here.. if the light is from above too I just feel something is off.
Countless7Echos:
I don't know just no sketch doodle day :p finished a video already so I'm pretty
7 hours ago
6 Replies
0 Medals
1 day ago
13 Replies
3 Medals
2 days ago
19 Replies
3 Medals
5 days ago
9 Replies
2 Medals