Mathematics Extension 1 Exam Predictions/Thoughts (2 Viewers)

worldno17

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will i lose a mark if i accidentally expressed alpha in terms of k instead of k in terms of alpha? i had k in terms of alpha a few lines up :'( did extra few lines of working to get alpha in terms of k ahhhhHhh
 

greetings

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How did you guys go about finding the angle in projectile?
I found dy/dx on the cartesian equation at the x-coord for A, then used angle between two lines with y=-x. Got 45° tho
 

tillitiger

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ye but also u can't use all of f(x) <= 1 anyway so u need to choose either x<-1 or -1<x<0 or 0<x<1 and looking at the actual equation given the -1<x<0 is the one where an inverse exists?
am I horrendously wrong
 

Arrowshaft

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How did you guys go about finding the angle in projectile?
I found dy/dx on the cartesian equation at the x-coord for A, then used angle between two lines with y=-x. Got 45° tho
75-45, so it came to an angle of 30 degrees
 

Arrowshaft

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ye but also u can't use all of f(x) <= 1 anyway so u need to choose either x<-1 or -1<x<0 or 0<x<1 and looking at the actual equation given the -1<x<0 is the one where an inverse exists?
am I horrendously wrong
Yeah I got -1<x<1, so I got A
 

PaxProbliscum

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guys for the binomial is it k = 5 or k = 14, since the question asks for which k for x^k = x^k + 1.
Plugging the expression into a calculator to expand gives that x^14 = x^15.

So is k = 14 the only correct answer here?
 

Arrowshaft

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guys for the binomial is it k = 5 or k = 14, since the question asks for which k for x^k = x^k + 1.
Plugging the expression into a calculator to expand gives that x^14 = x^15.

So is k = 14 the only correct answer here?
Yep k=14 is correct
 

Balajanovski

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Man. I'm so disappointed with how I went in this paper.
I wasn't able to complete 14ii, but I was able to finish everything else.
However, the solution was so simple and I'm kicking myself that I didn't see it.

Fuck, I honestly found the 4u paper easier.
 

Idkwhattoput

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Is it just me, or did anyone else notice that the projectile motion question asked to not only find the distance OA, but also the point A?
 

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