Can anyone show me how to arrive at y =17 when X = -2

Seems that my GCSE Bodmas is failing me. I keep getting y= 1

y = 2(-2)²-5(-2)-1

y = 2(-4)-5(-2)-1

y = -8+10–1

y = 1

But that is not what the graph does. The graph is y = 17 when X = -2.

You have your first term wrong. (-2)^2 is 4, not -4.

So the first term is 8, not -8. which is your 16 difference.

Arghh. Thank you. It's been a while since I did maths with pen and paper.

It’s that bloody “.” notation the Yanks use for multiplication that confuses me.

Not just the yanks. Was standard at university 40 years ago.

x is confusing algebraically if you are using x as a variable. Which you start to write as back to back C’s

Hang on you might be right

Yes, the X used to confuse me no end.

Also took me ages to understand what to do with to the terms when moving them over the other side of the equals sign.

Just do it the slow way. Add things to both sides, or subtract/multiply/divide to eliminate the term on one side and bring it yo the other.

Changing the side, changing the sign is the way I was taught to think of it. It was a crap way of teaching it.

The modern way is, or should be, to perform the same mathematical step on each side and see where it takes you. Well, in a general sense that is.

However, it doesn't really come into the equation above.