TutorMe homepage

SIGN IN

Start Free Trial

Piyush P.

Electrical and Electronics Engineer and Master's Student

Tutor Satisfaction Guarantee

Calculus

TutorMe

Question:

Calculate deirvative of Dx ln(x^2 + 1) ?

Piyush P.

Answer:

Use CHAIN RULE, Dx ln(x^2 + 1) = 2x * 1/(x^2 + 1) =2x/(x^2 + 1) is the answer.

Electrical Engineering

TutorMe

Question:

What is “pu” in electrical engineering?

Piyush P.

Answer:

Pu stands for per unit and this will be used in single line diagram of power distribution and it is like a huge electrical circuit with no of components (generators, transformers, loads) with different ratings (in MVA and KV). To bring all the ratings into the common platform we use pu concept in which, in general, largest MVA and KV ratings of the component is considered as base values, then all other component ratings will get back into this basis.Those values are called as pu values. (p.u=actual value/base value).

Algebra

TutorMe

Question:

If x^3+y^3=9 and x+y=3 then the value of x^4+y^4 is, 1. 81 2. 32 3. 27 4. 17

Piyush P.

Answer:

Whenever you meet x^3+y^3=9 and x+y=3 together straightway go for the expression x^3+y^3=(x+y)×(x2−xy+y^2) which results in, 9 = 3×((x+y)^2−3xy) =3×(9−3xy) =27−9xy or, xy = 2. Now easiest way to get x^4+y^4 is to multiply the first two given expressions together, giving, x4+y^4+xy(x^2+y^2 )= 27. So, x^4+y^4 = 27−2×((x+y)^2−2xy) =27−2×(9−4) =17 Answer: Option 4: 17. Key concepts used: Use of x^3+y^3=9 and x+y=3 together to get the value of xy -- get target value by direct multiplication of given two expressions and using the value of xy.

Send a message explaining your

needs and Piyush will reply soon.

needs and Piyush will reply soon.

Contact Piyush

Ready now? Request a lesson.

Start Session

FAQs

What is a lesson?

A lesson is virtual lesson space on our platform where you and a tutor can communicate.
You'll have the option to communicate using video/audio as well as text chat.
You can also upload documents, edit papers in real time and use our cutting-edge virtual whiteboard.

How do I begin a lesson?

If the tutor is currently online, you can click the "Start Session" button above.
If they are offline, you can always send them a message to schedule a lesson.

Who are TutorMe tutors?

Many of our tutors are current college students or recent graduates of top-tier universities
like MIT, Harvard and USC.
TutorMe has thousands of top-quality tutors available to work with you.

Made in California

© 2019 TutorMe.com, Inc.