Common Errors in the Exams

[nerd]

Just thought it would be interesting to get everyone to put together a list of common errors and mistakes that people make in the exams.

I'll start:

*Leaving out and when integrating.

*When solving logs, not checking your solutions to see if they fit into the appropriate domain.

[Collin Li]

* When squaring both sides, not checking your solutions to see if they fit into the appropriate domain.

[Toothpaste]

• [b]Composite functions[/b] - not checking whether they are defined or not.
• Expanding - e.g.     wrong:    correct:
• Finding the equation of a tangent/normal - using the wrong gradient, finding the tangent and not the normal and vice versa, finding the gradient but forgetting to find the actual equation using .
• Undifferentiable parts of a function - endpoints, cusps (i.e. the pointy bit of the "V" absolute graph)... etc
• Mixing up rules - product rule, quotient rule, chain rule ...

[Mao]

Arithmetic errors
Arithmetic errors
ARITHMETIC ERRORS

[SoLe!]

Not knowing how to gun the calculator

[shinny]

GIVING ANSWERS IN THE REQUIRED FORM #%()&#(*%&#*(%&(
(3 decimal places, 3 sig. figs, and for spesh, in polar/cartesian form etc.)

[Ken]

Crossing out the wrong multiple choice answer on the separate sheet

[bucket]

Stupid graphing errors:
-using the wrong circle (open/closed)
-not showing an asymptote if there is one
-intercepts.... bleh

maybe its just me who makes these errors

[Captain]

Multiple choice: If I don't get an answer correct, start from scratch again.  Currently, I get fixated on a question for 10 minutes, refusing to believe my answer is wrong, and theirs must be.

Haha

[/0]

Let's see what I've stuffed up so far

- Not remembering , is always always positive.
- Cubing a negative number and getting the bloody sign wrong
- Differentiating cos(x) and forgetting the bloody minus sign.
- Rounding to to many/to few decimal places.
- Putting the range of a function instead of the domain.
- Putting the domain/range of the wrong bloody function.
   > Drawing the graph of the wrong function.
- Drawing the graph/stating domain-range of an inverse function and forgetting the restriction on the original function.
- Integrating when I am supposed to differentiate
- Numerator in square root CAN be zero, demoninator CAN'T be zero.
- Dilating from wrong axis.
- Ignoring the domain of a probability density function when sketching a graph.
- Finding the wrong area bounded by a graph and axes.

[Ken]

eating too much before the exam

[dusty_girl1144]

eating too much before the exam

LOL  :2funny:

forgettin to set the calculator to the right mode

eg radian or degrees

[phagist_]

When square rooting, neglecting the negative root.

[dusty_girl1144]

table of values wrong, u know the sin(30)= .5

...


yeah u guys get what i mean

[AppleXY]

lol  sin(30) = .5 is correct, it's not wrong

- Confusing Normal Distributions. (eg. Pr(Z < 1) =! Pr(Z < -1) etc )