Hello,
Unless you didn't copy the text well, I don't see any mistake in your working
Hi,
Could somebody please tell me where I'm going wrong, or if it's the book that's wrong on this (easy) question:
I get:
The book however has the answer as:
I'm pretty sure I'm right because multiplying it out gives 0.5, but I tried it in an online solver and they come out with the same answer as the book.