Year 12s: what will be the first way you research your future options? >>

Simplify indices help? (C1)

Hi worked this out but when I pop it in wolfram alpha I'm a bit off -

Q - simplify - y^-2 x 1/(6y^3)^-3

My Working -


1/y^2 x 1/(6y^3)^-3

y^2 / (6y^3)^-3

(6y^3)^3 / y^2

216y^9 / x^2

216y^7

Wolfram alpha seems to think its 216y^8 ?

Am I being stupid somewhere?

Thanks,

Tom :smile:

Reply 1

usycool1

Original post by dathtom

Hi worked this out but when I pop it in wolfram alpha I'm a bit off -

Q - simplify - y^-2 x 1/(6y^3)^-3

My Working -


1/y^2 x 1/(6y^3)^-3

y^2 / (6y^3)^-3

(6y^3)^3 / y^2

216y^9 / x^2

216y^7

Wolfram alpha seems to think its 216y^8 ?

Am I being stupid somewhere?

Thanks,

Tom :smile:

You're right, and Wolfram alpha doesn't say that either, you probably typed it in incorrectly :tongue:

Reply 2

dathtom

Original post by usycool1

You're right, and Wolfram alpha doesn't say that either, you probably typed it in incorrectly :tongue:

Ah it was because I typed it into Wolfram Alpha as the question appeared with x's instead of y's. It probably thought the 'x' I put in for multiplication was another x.

Thanks anyway! :biggrin:

Reply 3

BlueSam3

Original post by dathtom

Ah it was because I typed it into Wolfram Alpha as the question appeared with x's instead of y's. It probably thought the 'x' I put in for multiplication was another x.

Thanks anyway! :biggrin:

Yeah, use * for multiplication instead.