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## #1 Re: Help Me ! » matrices » 2006-02-05 01:04:29

if i3

i put an extra i in there by accident

## #2 Help Me ! » matrices » 2006-02-04 03:16:33

Replies: 2

i have 2 equations

12-20i-5(i+I)= 0
8-5I-5(i+I)=0

ifi i3 = i+I determine the values by solving 1 and 2 by matrices....

i havent got a clue what to do can anyone do it?

## #3 Re: Help Me ! » Quadratic Equation - cant do it! » 2006-02-04 03:10:48

thanks a lot but what is a b and c?

## #4 Help Me ! » Complex Numbers » 2006-02-04 03:07:26

Replies: 1

four coplanar forces act at a point in the centre of pic (attached).

i need to determine the value of the resultant force using complex notation (expressing answers in polar and cartesian form, showing results in an argand diagram).

im baffled and dont know what to do, can anybody help me?

## #5 Help Me ! » Quadratic Equation - cant do it! » 2006-02-04 01:48:10

Replies: 4

a body moving with uniform acceleration exhibits the relationship

s=ut+0.5at^2

s= distance
u= initial velocity
a= acceleration
t= time

if an object falls and passes a point 40m above ground at a velocity of 10m/s how long does it take to hit the ground by: