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Core 3 Inverse Functions

Jimmy20002012

Can anyone help me on question on bii, I have got to +/- square root of 3y+4, but not sure how to pick if it is plus or minus?

ImageUploadedByStudent Room1428005048.671162.jpg

ImageUploadedByStudent Room1428005048.671162.jpg

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Reply 1

Incubator

Replace f(x) with x and replace x with y. Then rearrange for y

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Reply 2

Kevin De Bruyne

Original post by Jimmy20002012

Can anyone help me on question on bii, I have got to +/- square root of 3y+4, but not sure how to pick if it is plus or minus?

ImageUploadedByStudent Room1428005048.671162.jpg

Posted from TSR Mobile

See the bold bit in the question :smile:

Reply 3

Phichi

Original post by Incubator

Replace f(x) with x and replace x with y. Then rearrange for y

Posted from TSR Mobile

Did you even read the OP?

Reply 4

Dalek1099

Original post by Jimmy20002012

Can anyone help me on question on bii, I have got to +/- square root of 3y+4, but not sure how to pick if it is plus or minus?

ImageUploadedByStudent Room1428005048.671162.jpg

Posted from TSR Mobile

remember the domain and inverse swap over for an inverse function compared to the function.