well i spend hours finding paturns, appliny formular to them
and i got out a really long equasion, and i simplified it and simplified it and proved that x3[/ = x3
i spent abput 2-3 hours on this question
and a massive 10+ page proof that i am not typing up proves that
x3 = x3
if any one can prove that 3n2 + 3n + 1 cannont be a perfect cube that can you tell me. it would help with this proof
when usinmg indution k =2 is easy
cause you can use and pythogorain triad to prove there is at least 1 sol
eg x=3,y=4 z=5
to prove for k = n+1 il try
lhs = xn+1 + yn+1
= x(xn + yn) + yn+1 -xyn
=xzn +y(yn + xn) -xyn - yxn
= xzn + yzn - xy(yn-1 + xn-1)
=...
no im not
thats why im timsing it by (1 - 7/28)
that gets rid of all the solution where AA and A are together
i assumed all the A's were identical, if they werent then the solution should be timsed by 6, but i think they are
read the paper throulg in reading time and deside what is the eaisest for you then
if this means doing question 1-3
them going to 7 and working bacwards do it
my advise is do question 1-3 first, no matter what order you do the last 4 in
threat two of the a's as 1 letter
so there are 8 letters and 2 thant can be together
= 8! * (1 - 7/28)
= 30,240
8! is the amount of ways they can be aranged
7 is the amount of pairs that are together in any 1 combo
28 is the amount of pairs of letters
Question 29
i am x meteres away from a diving board, the angle (as i see it) between then 1 m and the 4m board is @, they are vertically alinged
show that @ = tan-1(4/x_ - tan-1(1/x)
show @ is a min when x=2
deduce that the min @ = tan-1 (3/4)
this would me much eaiser proved without induction, but any way
Q 27
a projectile is launced of a 50m cliff and hits the ground 200 from the foot of the cliff. it was fired with a velocity 40m/s and angle @
find the 2 posible values of @
is that exacly as it was
as in is that it word for word
was there any previous work that might help it
did it step it out at all
thats dam hard, only way i can think of is with a massive tree